Various minor adjustments to snippets

UltiSnips/rust.snippets

@@ -75,3 +75,14 @@ endsnippet
 snippet println "println" A
 println!("$1");$0
 endsnippet
+
+snippet docstring "Document head" b
+/*
+* Filename:    `!p snip.rv = fn`
+* Author:      ${1:Yannick Reiss}
+* Project:     ${2:Project Name}
+* Copyright:   ${3:None}       =>  You • 9 months ago • Move of Snippets into repository
+* Description: ${4:Funny module}
+*
+*/$0
+endsnippet