Fix typo and spelling inconsistency in CONTRIBUTING.md

Fix spellings of GitHub

Remove unnecessary changes

Fix GitHub spelling on doc/translation_process.md

doc/zmq.md

@@ -1,4 +1,4 @@
-# Block and Transaction Broadcasting With ZeroMQ
+# Block and Transaction Broadcasting with ZeroMQ
 
 [ZeroMQ](http://zeromq.org/) is a lightweight wrapper around TCP
 connections, inter-process communication, and shared-memory,
@@ -50,7 +50,7 @@ during the *configure* step of building bitcoind:
     $ ./configure --disable-zmq (other options)
 
 To actually enable operation, one must set the appropriate options on
-the commandline or in the configuration file.
+the command line or in the configuration file.
 
 ## Usage