fs/fs_parse: Correct comments of fs_validate_description()

For fs_validate_description(), its comments easily mislead reader that
the function will search array @desc for duplicated entries with name
specified by parameter @name, but @name is not used for search actually.

Fix by marking name as owner's name of these parameter specifications.

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>