DOC: typo fix and adding correct command for environment deactivation…

Author: harshul1610 <[email protected]>

Closes #13413 from harshul1610/master and squashes the following commits:

6108138 [harshul1610] DOC- typo fix and adding correct command for environment deactivation for windows and linux

Author: harshuljain13

doc/source/contributing.rst

@@ -188,7 +188,7 @@ To work in this environment, Windows users should ``activate`` it as follows::
 
       activate pandas_dev
 
-Mac OSX and Linux users should use::
+Mac OSX / Linux users should use::
 
       source activate pandas_dev
 
@@ -198,10 +198,14 @@ To view your environments::
 
       conda info -e
 
-To return to you home root environment::
+To return to your home root environment in Windows::
 
       deactivate
 
+To return to your home root environment in OSX / Linux::
+
+      source deactivate
+
 See the full conda docs `here <http://conda.pydata.org/docs>`__.
 
 At this point you can easily do an *in-place* install, as detailed in the next section.