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: https://github.com/nodejs/node/pull/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>