Documentation: Fix multiple typo in Documentation

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt
index bbe6cb3..879b6e3 100644
--- a/Documentation/dmaengine.txt
+++ b/Documentation/dmaengine.txt
@@ -63,7 +63,7 @@
 				  struct dma_slave_config *config)
 
    Please see the dma_slave_config structure definition in dmaengine.h
-   for a detailed explaination of the struct members.  Please note
+   for a detailed explanation of the struct members.  Please note
    that the 'direction' member will be going away as it duplicates the
    direction given in the prepare call.