Fix spacing of codeblocks in various docs

Without proper spacing, codeblocks will not color
correctly, so this aligns all codeblocks with the
list items they are nested beneath

doc/administration/geo/replication/troubleshooting.md

@@ -167,7 +167,7 @@ sudo gitlab-rake gitlab:geo:check
    ```
 
    - Ensure that you have the `gitlab_rails['db_password']` set to the plain text-password used when creating the hash for `postgresql['sql_user_password']`.
-```
+
 1. Rails is unable to connect to the database
 
    ```plaintext

doc/integration/vault.md

@@ -22,6 +22,7 @@ The following assumes you already have Vault installed and running.
       making sure to select the **OpenID** scope.
    1. Save application.
    1. Copy client ID and secret, or keep the page open for reference.
+
    ![GitLab OAuth provider](img/gitlab_oauth_vault_v12_6.png)
 
 1. **Enable OIDC auth on Vault:**
@@ -85,9 +86,11 @@ The following assumes you already have Vault installed and running.
    1. Go to your Vault UI (example: [http://127.0.0.1:8200/ui/vault/auth?with=oidc](http://127.0.0.1:8200/ui/vault/auth?with=oidc)).
    1. If the `OIDC` method is not currently selected, open the dropdown and select it.
    1. Click the **Sign in With GitLab** button, which will open a modal window:
+
    ![Sign into Vault with GitLab](img/sign_into_vault_with_gitlab_v12_6.png)
 
    1. Click **Authorize** on the modal to allow Vault to sign in through GitLab. This will redirect you back to your Vault UI as a signed-in user.
+
    ![Authorize Vault to connect with GitLab](img/authorize_vault_with_gitlab_v12_6.png)
 
 1. **Sign in using the Vault CLI** (optional):