message: Add a better \begin snippet
diff: },
  "begin": {
  "prefix": "\\begin",
  - "body": "\\begin",
  - "description": "Begin a text environment. Append a { for more autocomplete items."
  + "body": "\\begin{${1:environment}}\n$0\n\\end{${1:environment}}",
  + "description": "Begin a text environment."
  },
  "item": {
  "prefix": "\\item",
  