Fix Documentation - Escape Backslashes (#281)

Makes the documentation easier to read as paths look kind of strange right now.

Author: CADawg

doc/installation.rst

@@ -23,8 +23,8 @@ Windows
 
 Download the zip file from the
 `sourceforce page <http://sourceforge.net/projects/snap7/files/>`_.
-Unzip the zip file, and copy* release\Windows\<Win64/Win32>\snap7.dll* somewhere
-in you system PATH, for example *C:\WINDOWS\system32*. Alternatively you can
+Unzip the zip file, and copy* release\\Windows\\<Win64/Win32>\\snap7.dll* somewhere
+in you system PATH, for example *C:\\WINDOWS\\system32*. Alternatively you can
 copy the file somewhere on your file system and adjust the system PATH.