[compliance] Replace 'may' with 'can' in note

Author: jensmaurer

source/lib-intro.tex

@@ -1491,7 +1491,7 @@
 the namespace-scope functions and function templates
 from the hosted library facilities.
 \begin{note}
-An implementation may provide a deleted definition
+An implementation can provide a deleted definition
 so that the result of overload resolution does not silently change
 when migrating a program from a freestanding implementation to
 a hosted implementation.