Add link providing more details about ERB in the 'Getting Started' documentation [ci skip]

Co-Authored-By: Akhil G Krishnan <[email protected]>

Add link providing more details about ERB in the 'Getting Started' documentation [ci skip]

Co-Authored-By: Akhil G Krishnan <[email protected]>

Fix link to point to html [ci skip]

Co-authored-by: Rafael Mendonça França <[email protected]>

Revert "Merge branch 'branch_new' of https://github.com/mguan2020/rails into pr/49640"

This reverts commit 94b8c7d579a74c528c4a85f3ce0f0853c4883fd1, reversing
changes made to 1353ca902f260dfb9bbe7680ede2650a670f659f.

Revert "Revert "Merge branch 'branch_new' of https://github.com/mguan2020/rails into pr/49640""

This reverts commit e9ced85c8f6afe0bc057bc6d8d4387718a7c3916.

Author: mguan2020

guides/source/getting_started.md

@@ -558,7 +558,7 @@ file, and replace its contents with:
 </ul>
 ```
 
-The above code is a mixture of HTML and *ERB*. ERB is a templating system that
+The above code is a mixture of HTML and *ERB*. ERB, short for [Embedded Ruby](https://docs.ruby-lang.org/en/3.2/ERB.html), is a templating system that
 evaluates Ruby code embedded in a document. Here, we can see two types of ERB
 tags: `<% %>` and `<%= %>`. The `<% %>` tag means "evaluate the enclosed Ruby
 code." The `<%= %>` tag means "evaluate the enclosed Ruby code, and output the