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/snippet-mode/field

@@ -1,6 +1,6 @@
-# name : ${ ...  } field
-# contributor : joaotavora
-# key : $f
+# name: ${ ...  } field
+# contributor: joaotavora
+# key: $f
 # key: field
 # --
 \${${1:${2:n}:}$3${4:\$(${5:lisp-fn})}\}$0

snippets/snippet-mode/mirror

@@ -1,6 +1,6 @@
-# name : ${n:$(...)} mirror
-# key : $m
-# contributor : joaotavora
+# name: ${n:$(...)} mirror
+# key: $m
+# contributor: joaotavora
 # key: mirror
 # --
 \${${2:n}:${4:\$(${5:reflection-fn})}\}$0

snippets/snippet-mode/vars

@@ -1,12 +1,12 @@
 # -*- mode: snippet -*-
-# name : Snippet header
-# contributor : joaotavora
+# name: Snippet header
+# contributor: joaotavora
 # key: vars
 # --
-# name : $1${2:
-# key : ${3:trigger-key}}${4:
-# keybinding : ${5:keybinding}}${6:
-# expand-env : (${7:})}
-# contributor : $6
+# name: $1${2:
+# key: ${3:trigger-key}}${4:
+# keybinding: ${5:keybinding}}${6:
+# expand-env: (${7:})}
+# contributor: $6
 # --
 $0