[util.smartptr.owner.{hash,equal}] Make section name match synopsis.

Author: burblebee

source/memory.tex

@@ -4864,7 +4864,7 @@
 \end{itemize}
 \end{note}
 
-\rSec3[util.smartptr.owner.hash]{Class \tcode{owner_hash}}
+\rSec3[util.smartptr.owner.hash]{Struct \tcode{owner_hash}}
 
 \pnum
 The class \tcode{owner_hash} provides ownership-based hashing.
@@ -4904,7 +4904,7 @@
 \end{note}
 \end{itemdescr}
 
-\rSec3[util.smartptr.owner.equal]{Class \tcode{owner_equal}}
+\rSec3[util.smartptr.owner.equal]{Struct \tcode{owner_equal}}
 
 \pnum
 The class \tcode{owner_equal} provides