Fix link to how to template (#37191)

docs/contributors/documentation/README.md

@@ -38,7 +38,7 @@ The handbook is organized into four sections based on the functional types of do
 
 ### Templates
 
-A [how to guide template](/docs/contributors/documentation/how-to-guide-template.md) is available to provide a common structure to guides. If starting a new how to guide, copy the markdown from the template to get started.
+A [how to guide template](https://raw.githubusercontent.com/WordPress/gutenberg/trunk/docs/contributors/documentation/how-to-guide-template.md) is available to provide a common structure to guides. If starting a new how to guide, copy the markdown from the template to get started.
 
 The template is based on examples from The Good Docs Project, see their [template repository for additional examples](https://github.com/thegooddocsproject/templates) to help you create quality documentation.