doc: fixed a grammatical error in path.md

It said, " The path.basename() methods returns the last portion....".
"Methods" was wrong and it is fixed to "method".

PR-URL: nodejs#33489
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/path.md

@@ -73,7 +73,7 @@ changes:
 * `ext` {string} An optional file extension
 * Returns: {string}
 
-The `path.basename()` methods returns the last portion of a `path`, similar to
+The `path.basename()` method returns the last portion of a `path`, similar to
 the Unix `basename` command. Trailing directory separators are ignored, see
 [`path.sep`][].