doc: remove "end user"

We use "end user" in ambiguous ways. Sometimes we mean the developer,
and sometimes we mean the application user. Use "developer" where
developer is meant.

Refs: https://docs.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/u/user-end-user

PR-URL: #35200
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

doc/api/deprecations.md

@@ -1726,7 +1726,7 @@ Type: Deprecation revoked
 
 Importing assert directly was not recommended as the exposed functions use
 loose equality checks. The deprecation was revoked because use of the `assert`
-module is not discouraged, and the deprecation caused end user confusion.
+module is not discouraged, and the deprecation caused developer confusion.
 
 ### DEP0090: Invalid GCM authentication tag lengths
 <!-- YAML

doc/api/documentation.md

@@ -38,8 +38,8 @@ The stability indices are as follows:
 > priority.
 
 Use caution when making use of Experimental features, particularly within
-modules. End users may not be aware that experimental features are being used.
-Bugs or behavior changes may surprise end users when Experimental API
+modules. Users may not be aware that experimental features are being used.
+Bugs or behavior changes may surprise users when Experimental API
 modifications occur. To avoid surprises, use of an Experimental feature may need
 a command-line flag. Experimental features may also emit a [warning][].
 

doc/api/domain.md

@@ -20,7 +20,7 @@ changes:
 <!-- source_link=lib/domain.js -->
 
 **This module is pending deprecation**. Once a replacement API has been
-finalized, this module will be fully deprecated. Most end users should
+finalized, this module will be fully deprecated. Most developers should
 **not** have cause to use this module. Users who absolutely must have
 the functionality that domains provide may rely on it for the time being
 but should expect to have to migrate to a different solution

doc/api/errors.md

@@ -224,7 +224,7 @@ above `constructorOpt`, including `constructorOpt`, will be omitted from the
 generated stack trace.
 
 The `constructorOpt` argument is useful for hiding implementation
-details of error generation from an end user. For instance:
+details of error generation from the user. For instance:
 
 ```js
 function MyError() {