Documentation: fix common spelling mistakes

This fixes several spelling mistakes in the Documentation/ tree, which
are caught by checkpatch.pl's spell checking.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/infiniband/ipoib.txt

@@ -25,7 +25,7 @@ Partitions and P_Keys
   main interface for a subinterface is in "parent."
 
   Child interface create/delete can also be done using IPoIB's
-  rtnl_link_ops, where childs created using either way behave the same.
+  rtnl_link_ops, where children created using either way behave the same.
 
 Datagram vs Connected modes