lib: graduate error codes that have been around for years

PR-URL: #58541
Reviewed-By: Dario Piotrowicz <dario.piotrowicz@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: jasnell

doc/api/errors.md

@@ -1796,8 +1796,6 @@ time.
 
 ### `ERR_INPUT_TYPE_NOT_ALLOWED`
 
-> Stability: 1 - Experimental
-
 The `--input-type` flag was used to attempt to execute a file. This flag can
 only be used with input via `--eval`, `--print`, or `STDIN`.
 
@@ -3093,17 +3091,13 @@ An invalid or unknown encoding option was passed to an API.
 
 ### `ERR_UNKNOWN_FILE_EXTENSION`
 
-> Stability: 1 - Experimental
-
 An attempt was made to load a module with an unknown or unsupported file
 extension.
 
 <a id="ERR_UNKNOWN_MODULE_FORMAT"></a>
 
 ### `ERR_UNKNOWN_MODULE_FORMAT`
 
-> Stability: 1 - Experimental
-
 An attempt was made to load a module with an unknown or unsupported format.
 
 <a id="ERR_UNKNOWN_SIGNAL"></a>
@@ -3181,8 +3175,6 @@ transformation with [type-stripping][].
 
 ### `ERR_USE_AFTER_CLOSE`
 
-> Stability: 1 - Experimental
-
 An attempt was made to use something that was already closed.
 
 <a id="ERR_VALID_PERFORMANCE_ENTRY_TYPE"></a>