Update profile link verification instructions (#19723)

Co-authored-by: Effy Elden <effy@effy.space>

config/locales/en.yml

@@ -1697,7 +1697,7 @@ en:
     seamless_external_login: You are logged in via an external service, so password and e-mail settings are not available.
     signed_in_as: 'Signed in as:'
   verification:
-    explanation_html: 'You can <strong>verify yourself as the owner of the links in your profile metadata</strong>. For that, the linked website must contain a link back to your Mastodon profile. The link back <strong>must</strong> have a <code>rel="me"</code> attribute. The text content of the link does not matter. Here is an example:'
+    explanation_html: 'You can <strong>verify yourself as the owner of the links in your profile metadata</strong>. For that, the linked website must contain a link back to your Mastodon profile. After adding the link you may need to come back here and re-save your profile for the verification to take effect. The link back <strong>must</strong> have a <code>rel="me"</code> attribute. The text content of the link does not matter. Here is an example:'
     verification: Verification
   webauthn_credentials:
     add: Add new security key