[mem.res.global] Replace 'shall synchronize with'; add reference

Author: eisenwave

source/memory.tex

@@ -6154,9 +6154,9 @@
 \pnum
 \remarks
 Calling the \tcode{set_default_resource} and
-\tcode{get_default_resource} functions shall not incur a data race.
+\tcode{get_default_resource} functions shall not incur a data race\iref{intro.races}.
 A call to the \tcode{set_default_resource} function
-shall synchronize with subsequent calls to
+synchronizes with subsequent calls to
 the \tcode{set_default_resource} and \tcode{get_default_resource} functions.
 \end{itemdescr}