update changelog and put a warning about changing the heading title

Author: spatten

Changelog.md

@@ -2,6 +2,7 @@
 
 ## 3.12.4
 - Add a summary of the snippet scan when the `--x-snippet-scan` flag is used ([#1613](https://github.com/fossas/fossa-cli/pull/1613))
+- Update snippet scanning documentation ([#1615](https://github.com/fossas/fossa-cli/pull/1615))
 
 ## 3.12.3
 - Licensing: applies a fix for proprietary license detection ([#1616](https://github.com/fossas/fossa-cli/pull/1616))

docs/features/snippet-scanning.md

@@ -84,6 +84,8 @@ However, the next time you scan that codebase we will only need to re-fingerprin
 The time it takes to scan newer versions of your codebase will depend on how many files in the new version have not been previously scanned. A file has been previously scanned if the exact same file has ever been snippet scanned. FOSSA recommends snippet scanning your codebase on a regular basis to keep scan times low.
 
 ## The Snippet Scan Summary
+<!-- Note: this section is linked to from the snippet scan summary in src/App/Fossa/Ficus/Analyze.hs. So if you change this heading name or the path
+to this file, you will need to update the link there as well -->
 
 When a Snippet Scan completes, the CLI will output a summary of the scan. It will look like this: