message: capitalize MergeTree module
diff: @@ -331,8 +331,8 @@ async function typeFile(
  }
  if (sharedString.client.getLength() === 0) {
  // pg marker that will remain at end of text
  - sharedString.insertMarker(insertPosition, mergeTree.MarkerBehaviors.Tile,
  - {[mergeTree.reservedTileLabelsKey]: ["pg"]});
  + sharedString.insertMarker(insertPosition, MergeTree.MarkerBehaviors.Tile,
  + {[MergeTree.reservedTileLabelsKey]: ["pg"]});
  }
  // Start inserting text into the string
  let code = fileText.charCodeAt(readPosition);
  