fs: fix dcache.h kernel-doc notation

Fix new kernel-doc notation warning in dcache.h:

  Warning(include/linux/dcache.h:316): Excess function parameter 'Returns' description in '__d_rcu_to_refcount'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc:	Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/dcache.h

@@ -307,7 +307,7 @@ extern struct dentry *__d_lookup_rcu(struct dentry *parent, struct qstr *name,
  * __d_rcu_to_refcount - take a refcount on dentry if sequence check is ok
  * @dentry: dentry to take a ref on
  * @seq: seqcount to verify against
- * @Returns: 0 on failure, else 1.
+ * Returns: 0 on failure, else 1.
  *
  * __d_rcu_to_refcount operates on a dentry,seq pair that was returned
  * by __d_lookup_rcu, to get a reference on an rcu-walk dentry.