Docs: Add missing `$user_data` parameter name to `lostpassword_post` and...

Docs: Add missing `$user_data` parameter name to `lostpassword_post` and `lostpassword_errors` filter DocBlocks.

Follow-up to [48084].

See #49521, #49572.
Built from https://develop.svn.wordpress.org/trunk@48085


git-svn-id: https://core.svn.wordpress.org/trunk@47852 1a063a9b-81f0-0310-95a4-ce76da25c4cd