docs(minimal reproductions): add perfect example (#29316)

docs/development/minimal-reproductions.md

@@ -6,6 +6,15 @@ We may ask you to create a "minimal reproduction" repository.
 
 A minimal reproduction is a repository with the _least_ amount of code and config that still triggers missing or wrong behavior.
 
+### Example of a perfect reproduction
+
+The [`renovate-reproductions/12260` repository](https://github.com/renovate-reproductions/12260) shows a perfect reproduction, because it:
+
+- Only has the files/config needed to trigger the bug
+- Explains the current behavior and the expected behavior in the `readme.md`
+- Links to the Renovate Issue, or Discussion in the `readme.md`
+- Uses headings to organize information
+
 ## Creating a minimal reproduction
 
 Please read this section in full _before_ starting on your minimal reproduction.
@@ -30,7 +39,10 @@ _Always_ follow these steps:
 1. Use the fewest number of repository files and dependencies
 1. Reduce your Renovate config to a minimum
 1. Remove private or secret information
-1. Create a `readme.md` file that explains the _current behavior_ and _expected behavior_
+1. Create a `readme.md` file and:
+   - Explain the _Current behavior_ and _Expected behavior_
+   - Link to the Renovate Issue or Discussion
+   - Use headings to organize the information
 1. Set the repository visibility to `public`
 1. Give us the link to the repository