Document generated module catalog behavior

Clarify that catalog table and linked module pages are generated from repository metadata and README summaries.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

src/docs/Modules/Catalog/index.md

@@ -14,7 +14,7 @@ Each module page should capture:
 
 ## Catalog generation
 
-The module list is intended to be generated from repository metadata and refreshed automatically.
+The module list and linked module pages are generated from PSModule repository metadata and README content, then refreshed automatically.
 
 <!-- MODULE_CATALOG_START -->
 

src/docs/Modules/index.md

@@ -16,6 +16,6 @@ This section is the local source of truth for:
 - [Module types](Module-Types.md)
 - [Test Specification](Test-Specification.md)
 - [Versioning](Versioning.md)
-- [Catalog](Catalog/index.md)
+- [Catalog](Catalog/index.md) (auto-generated from PSModule repo metadata, release data, and README summaries)
 - [Process-PSModule](Process-PSModule/index.md)
 - [Dashboard Extension](Dashboard-Extension/index.md)