NFS: Fix typo in comments of nfs_readdir_alloc_pages()

This fixes the typo in comments of nfs_readdir_alloc_pages().
Because nfs_readdir_large_page and nfs_readdir_free_pagearray had been
renamed.

Signed-off-by: Liguang Zhang <zhangliguang@linux.alibaba.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/dir.c

@@ -605,8 +605,8 @@ void nfs_readdir_free_pages(struct page **pages, unsigned int npages)
 }
 
 /*
- * nfs_readdir_large_page will allocate pages that must be freed with a call
- * to nfs_readdir_free_pagearray
+ * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call
+ * to nfs_readdir_free_pages()
  */
 static
 int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages)