Further attempt to fix links in docs

Author: mpilgrem

CONTRIBUTING.md

@@ -706,7 +706,7 @@ project‑level configuration (`stack.yaml`). But there are also Dev Containers
 for the experimental project‑level configurations.
 
 For further information, see the documentation for
-[Dev Containers](doc/dev_containers.md).
+[Dev Containers](dev_containers.md).
 
 ## Slack channel
 

doc/dev_containers.md

@@ -156,7 +156,7 @@ root of the workspace: `cp -f .devcontainer/assets/cradles/cabal/hie.yaml .`
 -->
 
 See the documentation at
-[Contributing: Haskell Language Server](CONTRIBUTING.md/#haskell-language-server)
+[Contributing: Haskell Language Server](../CONTRIBUTING.md/#haskell-language-server)
 for cradles (`hie.yaml` files) that should suffice to configure the HLS
 explicitly for `./Setup.hs` and each of the buildable components in Stack's
 Cabal file.