fix(auth domain): improving heading

src/content/docs/accounts/accounts-billing/new-relic-one-user-management/authentication-domains-saml-sso-scim-more.mdx

@@ -63,7 +63,7 @@ If you have existing domains, they'll be on the left. Note that most organizatio
 
 To create a new domain from the authentication domain UI page, click **Create new**. For more about the configuration options, keep reading.
 
-## Source of users: Manual versus SCIM [#source-users]
+## Source of users: manual provisioning versus SCIM provisioning [#source-users]
 
 <Callout variant="tip">
   For an introduction to our SAML SSO and SCIM offerings, please read [Get started with SSO and SCIM](/docs/accounts/accounts-billing/new-relic-one-user-management/introduction-saml-scim). 
@@ -80,7 +80,7 @@ Notes on these settings:
 
 For how to set up SCIM, see [Automated user management](/docs/accounts/accounts/automated-user-management/automated-user-provisioning-single-sign).
 
-## Authentication [#authentication]
+## Authentication: username/password versus SAML SSO  [#authentication]
 
 The authentication method is the way in which New Relic users log in to New Relic. All users in an authentication domain have a single authentication method. There are two authentication options: