CI: markdown link checker (#7145)

* change (CI): markdown link checker

* Fix some invalid doc links (re-run of cargo-unleash gen-readme w/ fixes).

* Fix some invalid doc links

* Fix some invalid doc links

* Fix some links

* Fix some links

* Apply @bkchr suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Fix more links

* Fix more links

* typo

* Fix more links

* Fix more links

* Ignore valid link .. check wrongly sees it as invalid

* Fix style issue

* Fix style issue

* change (CI): update style guide link

* change (lib): suggestions

Co-authored-by: Dan Forbes <dan@danforbes.dev>
Co-authored-by: Steve Degosserie <steve@parity.io>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

Author: 4 people

README.md

@@ -2,9 +2,9 @@
 
 The Timestamp module provides functionality to get and set the on-chain time.
 
-- [`timestamp::Trait`](https://docs.rs/pallet-timestamppallet-timestamp/latest/pallet_timestamp/trait.Trait.html)
-- [`Call`](https://docs.rs/pallet-timestamppallet-timestamp/latest/pallet_timestamp/enum.Call.html)
-- [`Module`](https://docs.rs/pallet-timestamppallet-timestamp/latest/pallet_timestamp/struct.Module.html)
+- [`timestamp::Trait`](https://docs.rs/pallet-timestamp/latest/pallet_timestamp/trait.Trait.html)
+- [`Call`](https://docs.rs/pallet-timestamp/latest/pallet_timestamp/enum.Call.html)
+- [`Module`](https://docs.rs/pallet-timestamp/latest/pallet_timestamp/struct.Module.html)
 
 ## Overview
 
@@ -69,6 +69,6 @@ the Timestamp module for session management.
 
 ## Related Modules
 
-* [Session](https://docs.rs/pallet-timestamppallet-session/latest/pallet_session/)
+* [Session](https://docs.rs/pallet-session/latest/pallet_session/)
 
 License: Apache-2.0