Fix links to lib/overrides.yml and other source files in Overrides documentation (#5244)
Fix links to lib/overrides.yml and other source files in Overrides documentation (#5244)

* Fix links to source files in docs/overrides.md

* Update docs/overrides.md

Co-authored-by: John Gardner <e36d49b36f1c453256531efcafb5a1ecb0806815@gmail.com>

Co-authored-by: John Gardner <e36d49b36f1c453256531efcafb5a1ecb0806815@gmail.com>
github/linguist,erkyrath/linguist,christop/linguist,erkyrath/linguist,erkyrath/linguist,github/linguist,github/linguist,github/linguist,christop/linguist,erkyrath/linguist