Update content based on Thom’s feedback

On the page where signed in users can download the agreement:

> The second sentence of that could probably just be 'You can [download
> a copy]'. And could go at the end of the previous paragraph. (We try
> to avoid 'here', and the 'if you need to' is probably unnecessary).

On the page where we give users a choice of agreement to sign:

> We could probably edit that callout down a bit to: '[Contact us] if
> you're not sure whether your organisation is a crown or non-crown
> body.'
>
> (Try to keep callouts to a single sentence if we can)

app/templates/views/agreement-choose.html

@@ -34,9 +34,8 @@
     </p>
     <div class="panel panel-border-wide">
       <p>
-        Unsure whether your organisation is a crown body? Contact
-        <a href="{{ url_for('main.support') }}">support</a>
-        and we’ll help you work it out.
+        <a href="{{ url_for('main.support') }}">Contact us</a> if you’re
+        not sure whether your organisation is a crown or non-crown body.
       </p>
     </div>
     <h2 class="heading-small">

app/templates/views/agreement-signed.html

@@ -19,10 +19,8 @@
 
     <p>
       Your organisation ({{ owner }}) has already accepted the GOV.UK
-      Notify data sharing and financial agreement.
-    </p>
-    <p>
-      If you need to you can <a href="{{ url_for('main.download_agreement') }}">download a copy here</a>.
+      Notify data sharing and financial agreement. You can
+      <a href="{{ url_for('main.download_agreement') }}">download a copy</a>.
     </p>
     <p>
       The agreement contains commercially sensitive information, so don’t share it more widely than you need to.