doc: cross-link util.TextDecoder and intl.md

Also, note about builds without ICU
and ASCII-sort some bottom references.

PR-URL: #14486
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/intl.md

@@ -16,6 +16,7 @@ programs. Some of them are:
 - The [WHATWG URL parser][]'s [internationalized domain names][] (IDNs) support
 - [`require('buffer').transcode()`][]
 - More accurate [REPL][] line editing
+- [`require('util').TextDecoder`][]
 
 Node.js (and its underlying V8 engine) uses [ICU][] to implement these features
 in native C/C++ code. However, some of them require a very large ICU data file
@@ -51,6 +52,7 @@ option:
 | [WHATWG URL Parser][]                   | partial (no IDN support)          | full                         | full                   | full
 | [`require('buffer').transcode()`][]     | none (function does not exist)    | full                         | full                   | full
 | [REPL][]                                | partial (inaccurate line editing) | full                         | full                   | full
+| [`require('util').TextDecoder`][]       | none (class does not exist)       | partial/full (depends on OS) | partial (Unicode-only) | full
 
 *Note*: The "(not locale-aware)" designation denotes that the function carries
 out its operation just like the non-`Locale` version of the function, if one
@@ -184,26 +186,27 @@ to be helpful:
 - [Test262][]: ECMAScript's official conformance test suite includes a section
   dedicated to ECMA-402.
 
-[btest402]: https://github.com/srl295/btest402
-[BUILDING.md]: https://github.com/nodejs/node/blob/master/BUILDING.md
-[BUILDING.md#full-icu]: https://github.com/nodejs/node/blob/master/BUILDING.md#build-with-full-icu-support-all-locales-supported-by-icu
-[`Date.prototype.toLocaleString()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
-[ECMA-262]: https://tc39.github.io/ecma262/
-[ECMA-402]: https://tc39.github.io/ecma402/
-[full-icu]: https://www.npmjs.com/package/full-icu
-[ICU]: http://icu-project.org/
 ["ICU Data"]: http://userguide.icu-project.org/icudata
 [`--icu-data-dir`]: cli.html#cli_icu_data_dir_file
-[internationalized domain names]: https://en.wikipedia.org/wiki/Internationalized_domain_name
+[`Date.prototype.toLocaleString()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString
 [`Intl`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Intl
 [`Intl.DateTimeFormat`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat
 [`NODE_ICU_DATA`]: cli.html#cli_node_icu_data_file
 [`Number.prototype.toLocaleString()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString
-[REPL]: repl.html#repl_repl
 [`require('buffer').transcode()`]: buffer.html#buffer_buffer_transcode_source_fromenc_toenc
+[`require('util').TextDecoder`]: util.html#util_class_util_textdecoder
 [`String.prototype.localeCompare()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/localeCompare
 [`String.prototype.normalize()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/normalize
 [`String.prototype.toLowerCase()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase
 [`String.prototype.toUpperCase()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+[BUILDING.md]: https://github.com/nodejs/node/blob/master/BUILDING.md
+[BUILDING.md#full-icu]: https://github.com/nodejs/node/blob/master/BUILDING.md#build-with-full-icu-support-all-locales-supported-by-icu
+[ECMA-262]: https://tc39.github.io/ecma262/
+[ECMA-402]: https://tc39.github.io/ecma402/
+[ICU]: http://icu-project.org/
+[REPL]: repl.html#repl_repl
 [Test262]: https://github.com/tc39/test262/tree/master/test/intl402
 [WHATWG URL parser]: url.html#url_the_whatwg_url_api
+[btest402]: https://github.com/srl295/btest402
+[full-icu]: https://www.npmjs.com/package/full-icu
+[internationalized domain names]: https://en.wikipedia.org/wiki/Internationalized_domain_name

doc/api/util.md

@@ -560,7 +560,8 @@ string += decoder.decode(); // end-of-stream
 Per the [WHATWG Encoding Standard][], the encodings supported by the
 `TextDecoder` API are outlined in the tables below. For each encoding,
 one or more aliases may be used. Support for some encodings is enabled
-only when Node.js is using the full ICU data.
+only when Node.js is using the full ICU data (see [Internationalization][]).
+`util.TextDecoder` is `undefined` when ICU is not enabled during build.
 
 ##### Encodings Supported By Default
 
@@ -1158,18 +1159,19 @@ deprecated: v0.11.3
 
 Deprecated predecessor of `console.log`.
 
+[`'uncaughtException'`]: process.html#process_event_uncaughtexception
 [`Array.isArray`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
 [`Buffer.isBuffer()`]: buffer.html#buffer_class_method_buffer_isbuffer_obj
 [`Error`]: errors.html#errors_class_error
 [`Object.assign()`]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
 [`console.error()`]: console.html#console_console_error_data_args
 [`console.log()`]: console.html#console_console_log_data_args
-[`'uncaughtException'`]: process.html#process_event_uncaughtexception
 [`util.inspect()`]: #util_util_inspect_object_options
 [`util.promisify()`]: #util_util_promisify_original
 [Custom inspection functions on Objects]: #util_custom_inspection_functions_on_objects
-[Customizing `util.inspect` colors]: #util_customizing_util_inspect_colors
 [Custom promisified functions]: #util_custom_promisified_functions
+[Customizing `util.inspect` colors]: #util_customizing_util_inspect_colors
+[Internationalization]: intl.html
+[WHATWG Encoding Standard]: https://encoding.spec.whatwg.org/
 [constructor]: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/constructor
 [semantically incompatible]: https://github.com/nodejs/node/issues/4179
-[WHATWG Encoding Standard]: https://encoding.spec.whatwg.org/