Fix broken TITLE in utf8.pod6

Author: Jan-Olof Hendig

doc/Type/utf8.pod6

@@ -1,9 +1,9 @@
 =begin pod
 
-=TITLE class X<utf8|utf, class>
+=TITLE class utf8
 
 =SUBTITLE Mutable uint8 buffer for utf8 binary data
-
+X<|utf, class>
     class utf8 does Blob[uint8] is repr('VMArray') {}
 
 A C<utf8> is a subtype of Blob which is specifically uint8 data for holding UTF-8