Grammar mistakes have been corrected

Change-Id: I3e19f22e78fe3904817b180687dc62a0a8a6bc77
Closes-Bug: #1487688

contrib/designate-ext-samplehandler/README.rst

@@ -1,4 +1,4 @@
 Sample Designate Notification Handler Extension
 ===============================================
 
-This repo provides a sample plugin for a custom notification hanler.
+This repo provides a sample plugin for a custom notification handler.

doc/source/integrations.rst

@@ -9,7 +9,7 @@ Reverse - FloatingIP
 ====================
 
 The FloatingIP PTR feature of Designate relies on information of the FloatingIP
-which is in a different service then Designate itself. It can be in any service
+which is in a different service than Designate itself. It can be in any service
 as long as their is a "plugin" for it that can be loaded via the configuration
 setting called "network_api".
 

rally-jobs/plugins/README.rst

@@ -7,4 +7,4 @@ plugins will be discoverable. There is no need in any extra configuration
 and there is no difference between writing them here and in rally code base.
 
 Note that it is better to push to Rally code base all interested and useful
-benchmarks, cause that simplifies a lot life of operators.
+benchmarks, as that simplifies a lot life of operators.