[version.syn] Rename smart_pointer_owner_equality to smart_ptr_owner_equality

For consistency: the use of "ptr" is already prevailing.

Author: tkoeppe

source/support.tex

@@ -748,7 +748,7 @@
 #define @\defnlibxname{cpp_lib_shared_ptr_weak_type}@              201606L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_shared_timed_mutex}@                201402L // also in \libheader{shared_mutex}
 #define @\defnlibxname{cpp_lib_shift}@                             202202L // also in \libheader{algorithm}
-#define @\defnlibxname{cpp_lib_smart_pointer_owner_equality}@      202306L // also in \libheader{memory}
+#define @\defnlibxname{cpp_lib_smart_ptr_owner_equality}@          202306L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_smart_ptr_for_overwrite}@           202002L // also in \libheader{memory}
 #define @\defnlibxname{cpp_lib_source_location}@                   201907L // freestanding, also in \libheader{source_location}
 #define @\defnlibxname{cpp_lib_span}@                              202002L // also in \libheader{span}