added reference to Unicode document

S15-unicode.pod

@@ -13,7 +13,7 @@
 =for table
     Created          2 December 2013
     Last Modified    10 October 2014
-    Version          7
+    Version          8
 
 This document describes how Unicode and Perl 6 work together. Needless to say,
 it would be good for your chosen reader to support various Unicode characters.
@@ -89,7 +89,7 @@ with un-precomposed graphemes properly.
 Formally Perl 6 graphemes are defined exactly according to Unicode Grapheme Cluster Boundaries 
 at level "extended" (in contrast to "taylored" or "legacy"), 
 see Unicode Standard Annex #29 UNICODE TEXT SEGMENTATION 
-L<http://www.unicode.org/reports/tr29/tr29-25.html#Grapheme_Cluster_Boundaries|3 Grapheme Cluster Boundaries>>. 
+L<3 Grapheme Cluster Boundaries|http://www.unicode.org/reports/tr29/tr29-25.html#Grapheme_Cluster_Boundaries>>. 
 This is the same as the Perl 5 character class
 
   \X   Match Unicode "eXtended grapheme cluster"