message: Fix Add MSF snippet for mathsf
diff: "body": "\\mathrm{${1:${TM_SELECTED_TEXT:text}}}",
  "description": "math roman font"
  },
  + "mathsf": {
  + "prefix": "MSF",
  + "body": "\\mathsf{${1:${TM_SELECTED_TEXT:text}}}",
  + "description": "math sans serif font"
  + },
  "mathbf": {
  "prefix": "MBF",
  "body": "\\mathbf{${1:${TM_SELECTED_TEXT:text}}}",
  