Use non-breaking spaces between Perl and 6.

Prince213 · Prince213 · commit a435e68748b3 · 2020-05-07T15:04:34.000+08:00
diff --git a/doc/Language/glossary.pod6 b/doc/Language/glossary.pod6
@@ -838,8 +838,8 @@ X<|Perl>
 
 The Perl programming language in its many forms.
 
-X<|Perl 6>
-=head1 Perl 6
+X<|Perl 6>
+=head1 Perl 6
 
 The name used for Raku before October 2019.
 
