fix spelling errors

Change-Id: I1ade1fcfb4060ecb1e3410d1c7681047c2c2d1b4
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>

docs/source/dev/compiling_and_installing/gnome_client.rst

@@ -38,7 +38,7 @@ Run the following from the project root directory:
     cmake ..
     make
 
-The following options are often usefull to append to the cmake line:
+The following options are often useful to append to the cmake line:
 
 .. code-block:: none
 

docs/source/dev/compiling_and_installing/lrc.rst

@@ -16,7 +16,7 @@ To install the appplication, type the following commands in a console, while in
     make -j3
     make install
 
-The following options are often usefull to append to the cmake line:
+The following options are often useful to append to the cmake line:
 
 .. code-block:: none
 

docs/source/dev/contributing.rst

@@ -17,7 +17,7 @@ Head to the settings section to set one of the following:
 In each Ring submodule there is a ``.gitreview`` file. It contains all the
 necessary info to send a patchset to our gerrit server.
 
-After you commited your changes (one or multiple commits) you can submit them
+After you committed your changes (one or multiple commits) you can submit them
 with:
 
 .. code-block:: bash

docs/source/dev/test/daemon.rst

@@ -3,7 +3,7 @@ Test the daemon
 
 The unit testing framework
 ##########################
-We use CppUnit on GNU ring project. You can find a simple tutorial with code exemple on the  `official website <http://cppunit.sourceforge.net/doc/cvs/cppunit_cookbook.html>`_.
+We use CppUnit on GNU ring project. You can find a simple tutorial with code example on the  `official website <http://cppunit.sourceforge.net/doc/cvs/cppunit_cookbook.html>`_.
 
 Tests
 #####

scripts/make-packaging-target.py

@@ -18,7 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # Creates packaging targets for a distribution and architecture.
-# This helps reduce the lenght of the top Makefile.
+# This helps reduce the length of the top Makefile.
 #
 
 import argparse