doc: Fix typo "is is" in Documentations

Fix double words "is is" in Documentations.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/hwmon/submitting-patches b/Documentation/hwmon/submitting-patches
index 4628646..3d1bac39 100644
--- a/Documentation/hwmon/submitting-patches
+++ b/Documentation/hwmon/submitting-patches
@@ -1,7 +1,7 @@
 	How to Get Your Patch Accepted Into the Hwmon Subsystem
 	-------------------------------------------------------
 
-This text is is a collection of suggestions for people writing patches or
+This text is a collection of suggestions for people writing patches or
 drivers for the hwmon subsystem. Following these suggestions will greatly
 increase the chances of your change being accepted.