Keep snippet vars definitions in a single format across all snippets and documentation.

The format is:

# var-name: value

Previously snippets used a mixture of the following formatting:

#var-name: value
#var-name : value
# var-name: value
# var-name : value

snippets/scala-mode/at.author

@@ -1,5 +1,5 @@
-#Author : Anders Bach Nielsen <andersbach.nielsen@epfl.ch>
-#name : @author name
+# Author: Anders Bach Nielsen <andersbach.nielsen@epfl.ch>
+# name: @author name
 # key: at
 # --
 @author ${1:name} $0