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/emacs-lisp-mode/point.yasnippet

@@ -1,6 +1,6 @@
-#contributor: Xah Lee (XahLee.org)
-#name: point
-#key: point
-#key: p
+# contributor: Xah Lee (XahLee.org)
+# name: point
+# key: point
+# key: p
 # --
 (point)