Fix a couple of broken links

source/partials/release_notes/_release-15-1-0.html.erb

@@ -4,7 +4,7 @@
   You'll never need to wish that Go supported your favorite kind of material repository, you can implement support for it yourself!
 </p>
 <p>
-  You can see all the SCM material plugins on the <% link_to 'Go Community plugins' '/plugins/index.html' %>. See how to write one, <a href="https://docs.gocd.org/current/extension_points/scm_extension.html">here</a>.
+  You can see all the SCM material plugins on the <a href="/plugins/index.html">Go Community plugins</a>. See how to write one, <a href="https://docs.gocd.org/current/extension_points/scm_extension.html">here</a>.
 </p>
 <p>
   Here's how the GitHub pull requests plugin looks in action (below). Read more about it in this <a href="https://www.gocd.org/2015/04/27/Feature-Branch-Support.html">blog post</a>. Watch out for more improvements in the UI around this area.
@@ -17,7 +17,7 @@
   for quite a lot of use cases, and we are excited to see plugins written against this endpoint even before release (yay, open source!).</p>
 <p> <a href="https://github.com/matt-richardson">@matt-richardson</a> has written a really nice generic notification plugin, which sends build notifications to any websocket listener! <a href="https://github.com/ashwanthkumar">@ashwanthkumar</a>              has written a great plugin to notify Slack about build status changes. <a href="https://github.com/srinivasupadhya/">@srinivasupadhya</a> has written a couple of nice notification plugins to update pull request statuses in GitHub and Atlassian
   Stash.</p>
-<p> You can see all of those plugins on the <% link_to 'Go Community plugins page' '/plugins/index.html' %>. See how to write one yourself, <a href="https://plugin-api.gocd.org/current/notifications/">here</a>.</p>
+<p> You can see all of those plugins on the <%= link_to 'Go Community plugins page' '/plugins/index.html' %>. See how to write one yourself, <a href="https://plugin-api.gocd.org/current/notifications/">here</a>.</p>
 <h4>Pipeline label shortening</h4>
 <p> This contribution by <a href="https://github.com/alexschwartz">@alexschwartz</a> helps declutter the Go Dashboard, by allowing the pipeline label to be trimmed, per material. This feature is really useful when dealing with unwieldy 40 character
   SHAs in pipelines with git/mercurial materials in them. This feature allows this: </p>

source/partials/release_notes/_release-18-4-0.md.erb

@@ -6,7 +6,7 @@
 
 This release primarily addresses performance issue caused by a config save, which slows down several requests because of a long-running database query executed in order to update the dashboard.
 
-We have performed some optimizations in order to significantly reduce the number of SQL calls executed. Read more about it <% link_to_issue 4706, 'here' %> and <%= link_to_issue '4705#issuecomment-386554649', 'here' %>.
+We have performed some optimizations in order to significantly reduce the number of SQL calls executed. Read more about it at <%= link_to_issue 4706 %> and <%= link_to_issue '4705#issuecomment-386554649' %>.
 
 <h4>Improvements</h4>
 

source/posts/2015-06-18-authentication-end-point.html.markdown.erb

@@ -86,7 +86,7 @@ We hope plugin developers are able to use this feature to support their organiza
 
 * [Developer Docs](https://plugin-api.gocd.org/current/authorization/)
 * [GitHub Issue](https://github.com/gocd/gocd/issues/851)
-* <% link_to 'Sample plugins' '/plugins/index.html' %>
+* <%= link_to 'Sample plugins', '/plugins/index.html' %>
 
 <style type="text/css">
 figure {