fs/nfs/pnfs_nfs.c: fix spelling typo and syntax error in comment

Fix spelling typo and syntax error in comment.
Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/pnfs_nfs.c

@@ -374,12 +374,12 @@ pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets,
 	return NULL;
 }
 
-/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head reqest
+/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head request
  *				   for @page
  * @cinfo - commit info for current inode
  * @page - page to search for matching head request
  *
- * Returns a the head request if one is found, otherwise returns NULL.
+ * Return: the head request if one is found, otherwise %NULL.
  */
 struct nfs_page *
 pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)