message: Add snippet documentation
diff: "command": "beginend",
  "snippet": "begin{$1}\n\t${0:${TM_SELECTED_TEXT}}\n\\end{$1}",
  "detail": "Insert \\begin/\\end",
  + "documentation": "Insert a `\\begin{} / \\end{}` pair and wrap the selected text if any. Autocompletion is automatically triggered to complete the environment name",
  "postAction": "editor.action.triggerSuggest"
  },
  "left(": {
  