remove extra .

doc/Language/101-basics.pod6

@@ -170,7 +170,7 @@ pairs.  Other programming languages call that a I<hash table>,
 I<dictionary>, or I<map>.  You can query a hash table for the value that
 corresponds to a certain C<$key> with C<%hash{$key}>N<Unlike Perl 5, in
 Perl 6 the sigil does not change when accessing an array or hash with
-C<[ ]> or C<{ }>. This is called X<I<sigil invariance>>.>.
+C<[ ]> or C<{ }>. This is called X<I<sigil invariance>>>.
 
 In the score counting program, C<%matches> stores the number of matches each
 player has won.  C<%sets> stores the number of sets each player has won. Both