docs: refer to the app as the Mend Renovate app (#23336)

docs/development/style-guide.md

docs/usage/configuration-options.md

docs/usage/faq.md

docs/usage/getting-started/installing-onboarding.md

docs/usage/getting-started/private-packages.md

docs/usage/getting-started/running.md

docs/usage/key-concepts/automerge.md

docs/usage/key-concepts/scheduling.md

docs/usage/known-limitations.md

docs/usage/merge-confidence.md

docs/usage/node.md

docs/usage/noise-reduction.md

docs/usage/php.md

docs/usage/reading-list.md

docs/usage/security-and-permissions.md

docs/usage/self-hosted-configuration.md

docs/usage/troubleshooting.md

docs/usage/user-stories/swissquote.md

lib/modules/manager/bundler/readme.md

lib/modules/manager/gomod/readme.md