documentation: clarify advanced guide link

[Lovlace777]

Summary

• Clarifies the final link on the How to page so it accurately points readers to the advanced guide's parameters page.
• Keeps the existing parameters.md target, which is present in the docs navigation and builds to /parameters/.
• Limits the change to docs/pages/how_to.md.

Validation

• D:\AI_practice\chores\tmp\arta-docs-venv\Scripts\python.exe -m mkdocs build -f docs\mkdocs.yaml --strict --site-dir D:\AI_practice\chores\tmp\arta-docs-site - passed; documentation built successfully and the generated How to page links to ../parameters/.
• python -m tox -e py311 - passed; 95 tests passed with 12 existing deprecation warnings.
• git diff --check - passed; Git reported only the local LF-to-CRLF working-tree warning.

Notes

• Closes Wrong link in documentation #63.
• Documentation-only change; no runtime compatibility impact.
• No changelog update included because this only clarifies an existing docs link.