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/erlang-mode/loop

@@ -1,4 +1,4 @@
-#name : loop(...) -> receive _ -> loop(...) end.
+# name: loop(...) -> receive _ -> loop(...) end.
 # key: loop
 # --
 ${1:loop}($2) ->