Documentation: filesystem: Fix typo in fs/eventfd.c

This patch fix typos found in Documentation/filesystems.xml,
DocBook/filesystems/API-eventfd-signal.html, and
DocBook/filesystems.aux.xml

These files are generated from comments within the source,
so I had to fix typos in fs/eventfd.c

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 8d0c0df..ed70cf9 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -45,10 +45,10 @@
  *
  * This function is supposed to be called by the kernel in paths that do not
  * allow sleeping. In this function we allow the counter to reach the ULLONG_MAX
- * value, and we signal this as overflow condition by returining a POLLERR
+ * value, and we signal this as overflow condition by returning a POLLERR
  * to poll(2).
  *
- * Returns the amount by which the counter was incrememnted.  This will be less
+ * Returns the amount by which the counter was incremented.  This will be less
  * than @n if the counter has overflowed.
  */
 __u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)