Minor doc updates

New version of About tab image, and link to GitHub issues page.

guiprep-userguide.html

@@ -621,7 +621,7 @@ <h3 id="ProgramPreferences">Program Preferences</h3>
 
 <h3 id="About">About</h3>
 <div style="margin-left: 40px;"> &nbsp;<img
- style="width: 644px; height: 513px;" alt="About tab" title=""
+ style="width: 610px; height: 512px;" alt="About tab" title=""
  src="pics/guiprep_about.png"> </div>
 
 <h2 id="Troubleshooting">Troubleshooting</h2>
@@ -630,7 +630,7 @@ <h2 id="Troubleshooting">Troubleshooting</h2>
 
 <p>Edit the guiprep.bat file in the guiprep directory, and create a new line at the bottom with the word "PAUSE" (no quotes, but all caps is preferred). That will keep the Perl window open after guiprep quits. Copy any text out of that window after the error occurs.</p>
 
-<p>Once you have all this information together, please report the problem in the <a href="https://www.pgdp.net/phpBB3/viewtopic.php?f=13&amp;t=2237">guiprep forum</a> on Distributed Proofreaders. Please also mention the version of guiprep you are running (which should be in the title bar of guiprep), your Perl version and your operating system and version.</p>
+<p>Once you have all this information together, please report the problem in the <a href="https://www.pgdp.net/phpBB3/viewtopic.php?f=13&amp;t=2237">guiprep forum</a> on Distributed Proofreaders. Please also mention the version of guiprep you are running (which should be in the title bar of guiprep), your Perl version and your operating system and version. Alternatively, you can report the problem via the <a href="https://github.com/DistributedProofreaders/guiprep/issues">GitHub guiprep issues page</a>.</p>
 
 <h3>Known Issues</h3>