JS: Update LinesOfCode.ql to match the style from C++

Author: asgerf

javascript/ql/src/Diagnostics/LinesOfCode.ql

@@ -1,8 +1,9 @@
 /**
- * @name Total lines of code
- * @description The total number of lines of code across all source files.
+ * @id js/summary/lines-of-code
+ * @name Total lines of JavaScript and TypeScript code in the database
+ * @description The total number of lines of JavaScript or TypeScript code across all files checked into the repository, except in `node_modules`. This is a useful metric of the size of a database. For all files that were seen during extraction, this query counts the lines of code, excluding whitespace or comments.
  * @kind metric
- * @id js/metrics/lines-of-code
+ * @tags summary
  */
 
 import javascript