message: chore: Modify heading
diff: - [Template String and Addon Factory](#template-string-and-addon-factory)
  - [GraphQL AST hooks](#graphql-ast-hooks)
  - [Custom Scalar hook](#custom-scalar-hook)
  - - [Write using `ctx.source`](#write-using-ctxsource)
  + - [Change output files' content using `ctx.source`](#change-output-files-content-using-ctxsource)
  - [Add TypeScript statement](#add-typescript-statement)
  - [Add import statement](#add-import-statement)
  - [Addon example](#addon-example)
  @@ -178,7 +178,7 @@ The above example maps `URL` custom scalar field to TypeScript string type.
  If `customScalar` function returns `undefined`, the core generator determines mapping result.
  -### Write using `ctx.source`
  +### Change output files' content using `ctx.source`
  `source` in the addon factory context is an utility object to help to change output type file's content.
  