Apply suggestions from code review

Co-authored-by: Katie Horne <katie@coder.com>

Author: johnstcn

guides/admin/oidc-azuread.md

@@ -103,7 +103,7 @@ the Coder UI.
 1. Log in to Coder, and go to **Manage** > **Admin** > **Authentication**.
 1. In the top-most drop-down box, select **OpenID Connect**.
 1. Provide the requested values for **Client ID**, **Client Secret**, and
-   **Issuer**. Additional scopes are not required.
+   **Issuer**. Optionally, you can specify **Additional Scopes**.
 
 When done, click **Save Preferences**.
 

guides/admin/oidc-google.md

@@ -66,7 +66,7 @@ Now that you've registered an app, you can provide the relevant **Client ID**,
 
 1. For the **Issuer**, provide `accounts.google.com`.
 
-1. For **Additional Scopes**, you can leave the default value (blank).
+1. For **Additional Scopes**, you can leave this value blank.
 
 1. Click **Save preferences**.
 

guides/admin/oidc-okta.md

@@ -85,7 +85,7 @@ the Coder UI.
 1. Log in to Coder, and go to **Manage** > **Admin** > **Authentication**.
 1. In the top-most drop-down box, select **OpenID Connect**.
 1. Provide the requested values for **Client ID**, **Client Secret**, and
-   **Issuer**. Additional scopes are not required.
+   **Issuer**. Optionally, you can specify **Additional Scopes**.
 
 When done, click **Save Preferences**.