Update base-template/doctype-example-guide.md

Co-authored-by: Cameron Shorter <[email protected]>

base-template/doctype-example-guide.md

@@ -4,7 +4,8 @@ This guide explains how to build a good example document for a specific `doctype
 
 The guide is designed to be read by a template author, someone who intends to create or improve a set of templates and guides for a `doctype`.
 
-{
+{Template author tip:
+
 * Add [machine readable structured metadata](https://developers.google.com/search/docs/guides/sd-policies) to your doctype example.
 * Structured metadata helps search engines index pages appropriately, and facilitates content reuse.
 * Within this project we have adopted the [JSON-LD](http://json-ld.org/) format for structured metadata, [as recommended by Google](https://developers.google.com/search/docs/guides/intro-structured-data).