Fixed typo

Plural form of synopsis works better

source/documentation/index.html

@@ -59,7 +59,7 @@ <h3>For Perl 5 programmers</h3>
         <h3>Compendiums and cheatsheets</h3>
    	<ul>
             <li><a href="http://doc.perl6.org/">Perl&nbsp;6 Documentation</a></li>
-            <li><a href="http://design.perl6.org/">Design Documents / Synopsis</a></li>
+            <li><a href="http://design.perl6.org/">Design Documents / Synopses</a></li>
 	    <li><a href="http://tablets.perl6.org">Perl Tablets</a>, a hypertext Perl&nbsp;6 compendium with lots of appendices</li>
       	    <li><a href="http://www.ozonehouse.com/mark/periodic/">Periodic table</a> of Perl&nbsp;6 operators</li>
             <li><a href="http://github.com/perl6/mu/raw/master/docs/Perl6/Cheatsheet/cheatsheet.txt">Perl&nbsp;6 Cheat Sheet</a></li>