[over.ics.rank] Replace self-referential reference with 'this subclause'

Author: tkoeppe

source/overloading.tex

@@ -2311,7 +2311,7 @@
 \rSec3[over.ics.rank]{Ranking implicit conversion sequences}
 
 \pnum
-\ref{over.ics.rank} defines a partial ordering of implicit conversion
+This subclause defines a partial ordering of implicit conversion
 sequences based on the relationships
 \term{better conversion sequence}
 and