message: Fix GitHub stylization
diff: @@ -60,7 +60,7 @@ external authentication provider. Please see a subset of possible providers and
  instructions to integrate them below. Steps 1 & 2 are described separately for
  each provider and steps beyond that are common for all.
  -<details><summary>Github</summary>
  +<details><summary>GitHub</summary>
  <p>
  ### 1. Open `app-config.yaml` and change it as follows
  @@ -334,7 +334,7 @@ above:
  | Auth Provider | Import Name |
  | ------------- | ------------------- |
  -| Github | githubAuthApiRef |
  +| GitHub | githubAuthApiRef |
  | Gitlab | gitlabAuthApiRef |
  | Google | googleAuthApiRef |
  | Microsoft | microsoftAuthApiRef |
  