update Quill docs to remove "Link" header

views/partials/auth-endpoint-help.php

@@ -1,3 +1,2 @@
     <p>You can create your own authorization endpoint, but it's easier to use an existing service such as <a href="https://indieauth.com/">IndieAuth.com</a>. To delegate to IndieAuth.com, you can use the markup provided below.</p>
     <p><pre><code>&lt;link rel="authorization_endpoint" href="https://indieauth.com/auth"&gt;</code></pre></p>
-    <p><pre><code>Link: &lt;https://indieauth.com/auth&gt;; rel="authorization_endpoint"</code></pre></p>

views/partials/micropub-endpoint-help.php

@@ -1,3 +1,2 @@
     <p>You will need to <a href="/creating-a-micropub-endpoint">create a Micropub endpoint</a> for your website which can create posts on your site. Once you've created the Micropub endpoint, you can indicate its location using the markup below.</p>
     <p><pre><code>&lt;link rel="micropub" href="https://<?= (property_exists($this, 'meParts') ? $this->meParts['host'] : 'example.com') ?>/micropub"&gt;</code></pre></p>
-    <p><pre><code>Link: &lt;https://<?= (property_exists($this, 'meParts') ? $this->meParts['host'] : 'example.com') ?>/micropub&gt;; rel="micropub"</code></pre></p>

views/partials/token-endpoint-help.php

@@ -3,4 +3,3 @@
        it's easier to use an existing service such as <a href="https://tokens.indieauth.com">tokens.indieauth.com</a>. 
        To use this service as your token endpoint, use the markup provided below.</p>
     <p><pre><code>&lt;link rel="token_endpoint" href="https://tokens.indieauth.com/token"&gt;</code></pre></p>
-    <p><pre><code>Link: &lt;https://tokens.indieauth.com/token&gt;; rel="token_endpoint"</code></pre></p>