Linkify readme text where appropriate to provide easy access to supporting information

Author: per1234

README.md

@@ -6,15 +6,15 @@ This action comments on the pull request with a report on the resulting change i
 
 ### `size-deltas-reports-artifact-name`
 
-Name of the workflow artifact that contains the memory usage data, as specified to the [`actions/upload-artifact`](https://github.com/actions/upload-artifact) action via its `name` input.
+Name of the [workflow artifact](https://docs.github.com/en/actions/configuring-and-managing-workflows/persisting-workflow-data-using-artifacts) that contains the memory usage data, as specified to the [`actions/upload-artifact`](https://github.com/actions/upload-artifact) action via its `name` input.
 
 **Default**: `"size-deltas-reports"`
 
 ### `github-token`
 
-GitHub access token used to comment the memory usage comparison results to the PR thread.
+[GitHub access token](https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token) used to comment the memory usage comparison results to the PR thread.
 
-**Default**: [`GITHUB_TOKEN`](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token).
+**Default**: [`GITHUB_TOKEN`](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
 
 ## Example usage