doc, util, console: clarify ambiguous docs

Add clarification to the documentation on util.format() and console.log()
regarding how excessive arguments are treated when the first argument is
a non-format string compared to when it is not a string at all.

Fixes: nodejs#13908

doc/api/console.md

@@ -246,9 +246,7 @@ console.log('count:', count);
 // Prints: count: 5, to stdout
 ```
 
-If formatting elements (e.g. `%d`) are not found in the first string then
-[`util.inspect()`][] is called on each argument and the resulting string
-values are concatenated. See [`util.format()`][] for more information.
+See [`util.format()`][] for more information.
 
 ### console.time(label)
 <!-- YAML

doc/api/util.md

@@ -186,7 +186,14 @@ returned string, each delimited by a space.
 util.format('%s:%s', 'foo', 'bar', 'baz'); // 'foo:bar baz'
 ```
 
-If the first argument is not a format string then `util.format()` returns
+Any non-object and non-symbol excessive argument will **not** have
+`util.inspect()` called on them.
+
+```js
+util.format('%s', 'foo', () => true); // 'foo () => true'
+```
+
+If the first argument is not a string then `util.format()` returns
 a string that is the concatenation of all arguments separated by spaces.
 Each argument is converted to a string using `util.inspect()`.