replace references to "Mirall" with "client"

doc/building.rst

@@ -139,15 +139,15 @@ To cross-compile:
 Generic Build Instructions
 --------------------------
 
-Compared to previous versions, building Mirall has become easier. Unlike
-earlier versions, CSync, which is the sync engine library of Mirall, is now
-part of the Mirall source repository and not a separate module.
+Compared to previous versions, building the desktop sync client has become easier. Unlike
+earlier versions, CSync, which is the sync engine library of the client, is now
+part of the client source repository and not a separate module.
 
-You can download Mirall from the ownCloud `Client Download Page`_.
+You can download the desktop sync client from the ownCloud `Client Download Page`_.
 
 To build the most up to date version of the client:
 
-1. Clone the latest versions of Mirall from Git_ as follows:
+1. Clone the latest versions of the client from Git_ as follows:
 
   ``git clone git://github.com/owncloud/client.git``