docs: add example of exact text for user request

for #1473

templates/docs.html

@@ -363,6 +363,13 @@ <h3 id="general">Using</h3>
 <p>Bridgy Fed will only message a given recipient once, the first time they're requested. If you or someone else request them again, Bridgy Fed won't message them again.</p>
 <p>Also, you can only request 10 users per day. Use them wisely!</p>
 <p>On Bluesky, Bridgy Fed has to poll for chat messages, so if you send it a message, it may not respond immediately. It will within a minute at most!
+
+<p>Here's an example of the exact text in the prompt DM:
+<blockquote>
+<p>Hi! <a href="https://bsky.app/profile/snarfed.indieweb.social.ap.brid.gy">Ryan Barrett · snarfed.indieweb.social.ap.brid.gy</a> is using Bridgy Fed to bridge their account from the fediverse into Bluesky here, and they'd like to follow you. You can bridge your account into the fediverse by following this account. <a href="https://fed.brid.gy/docs">See the docs</a> for more information.
+<p>If you do nothing, your account won't be bridged, and users on the fediverse won't be able to see or interact with you.
+<p>Bridgy Fed will only send you this message once.
+</blockquote>
 </li>
 
 <li id="migration" class="question">Is account migration supported?</li>