Fix typo

src/ui/pages/help.html

@@ -943,7 +943,7 @@
 							<li>The last saved path cannot be remembered by default. To circumvent this limitation,
 								disable the option "Misc. &gt; Save pages in background".</li>
 							<li>The following characters are replaced with _ in filenames: ~, +, \, ?, %, *, :, |, ",
-								&lt;, &gt; This is done to maintain compatibility with various OSs and file systems. 
+								&lt;, &gt;. This is done to maintain compatibility with various OSs and file systems. 
 								If you don't need that level of compatibility and know what you are doing, you can 
 								change the list of forbidden characters in 
 								<a href="https://github.com/gildas-lormeau/SingleFile/wiki/Hidden-options">Hidden options</a>.</li>