fix(Options Page): Tweaks the language in the tooltip for the externa…

…l viewer option

Hopefully this will simplify things for users that have this problem.

options.html

@@ -33,7 +33,7 @@
     <div>
       <label
 	 class="hidden" id="external_pdf_label"
-	 title="Tells RECAP to save PDFs as downloaded files, rather than set up for in-browser viewing. Check this box when the browser is also set to an external PDF viewers, otherwise filenames will be random characters rather than structured.">
+	 title="Tells RECAP to save PDFs as downloaded files, rather than set up for in-browser viewing. If you see filenames with random characters, check this box.">
       <input type="checkbox" id="external_pdf">
       Force external PDF viewing (download PDFs)<br></label>
       <input type="radio" id="ia_style_filenames"