cleanup(tex): a more sensible snippet for description

This snippet creates the initial `\item` and puts the cursor to start
writing the description name or take it from ${VISUAL}

Author: cristobaltapia

UltiSnips/tex.snippets

@@ -50,7 +50,7 @@ endsnippet
 
 snippet desc "Description" bi
 \begin{description}
-	$0${VISUAL}
+	\item[${1:${VISUAL}}] $0
 \end{description}
 endsnippet