docs(docs/overview/index.md): remove AI-generated phrasing

Rules: TITLE-CASE (2 occurrences)

Signed-off-by: Eike Waldt <waldt@b1-systems.de>
On-behalf-of: SAP <eike.waldt@sap.com>
Assisted-by: Kilo:claude-opus-4-7
Assisted-by: Kilo:claude-sonnet-4-6

Author: yeoldegrove

docs/overview/index.md

@@ -14,7 +14,7 @@ github_source_path: docs/overview/index.md
 github_target_path: "docs/reference/supporting_tools/python-gardenlinux-lib.md"
 ---
 
-# Garden Linux Python Library Documentation
+# Garden Linux Python library documentation
 
 Welcome to the Garden Linux Python Library documentation. This library provides
 Python tools and utilities for working with Garden Linux features, flavors, OCI
@@ -78,7 +78,7 @@ For more examples and for all CLI tools, see the **Command-Line Interface** and
 **API Reference** sections in the docs:
 [https://gardenlinux.github.io/python-gardenlinux-lib/](https://gardenlinux.github.io/python-gardenlinux-lib/)
 
-## Quick Start
+## Quick start
 
 ### Command-Line Interface