docs: update the support page for adding new companies to the list

To be included on the support page, companies should have some
commitment to the upstream community and be willing to
contribute.

Signed-off-by: Travis Nielsen <tnielsen@redhat.com>

Author: travisn

support.html

@@ -65,7 +65,10 @@ <h2><a href="{{ redHatLink }}">Red Hat</a></h2>
     <section class="grid-middle">
         <div class="col-12_md-12">
             <p>
-                To add your company to the list of support providers, please open a pull request against the <a href="https://github.com/rook/rook.github.io">rook.github.io repository</a>.
+                Does your company want to be added to the list of support providers? If so, open an
+                <a href="https://github.com/rook/rook.github.io/issues">issue</a> with
+                details about your company and your plans for contributing back to the Rook
+                community. Rook maintainers will look forward to your contributions!
             </p>
         </div>
     </section>