doc: remove stability from unreleased errors

Remove stability indicators from errors that only existed on the master
branch and are not in the release.

PR-URL: #33764
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/errors.md

@@ -2486,8 +2486,6 @@ releases.
 <a id="ERR_ENTRY_TYPE_MISMATCH"></a>
 #### `ERR_ENTRY_TYPE_MISMATCH`
 
-> Stability: 1 - Experimental
-
 The `--entry-type=commonjs` flag was used to attempt to execute an `.mjs` file
 or a `.js` file where the nearest parent `package.json` contains
 `"type": "module"`; or
@@ -2526,8 +2524,6 @@ while trying to read and parse it.
 <a id="ERR_INVALID_REPL_TYPE"></a>
 #### `ERR_INVALID_REPL_TYPE`
 
-> Stability: 1 - Experimental
-
 The `--entry-type=...` flag is not compatible with the Node.js REPL.
 
 <a id="ERR_FEATURE_UNAVAILABLE_ON_PLATFORM"></a>