[customization.point.object][meta.trans.other] Replace "user-defined" added by P0898R3 with "program-defined"

...to be consistent with the intent of LWG2139

Author: CaseyCarter

source/lib-intro.tex

@@ -944,8 +944,8 @@
 
 \pnum
 A \term{customization point object} is a function object\iref{function.objects}
-with a literal class type that interacts with user-defined types while enforcing
-semantic requirements on that interaction.
+with a literal class type that interacts with program-defined types while
+enforcing semantic requirements on that interaction.
 
 \pnum
 The type of a customization point object shall satisfy
@@ -970,15 +970,16 @@
 \pnum
 \begin{note}
 Many of the customization point objects in the library evaluate function call
-expressions with an unqualified name which results in a call to a user-defined
-function found by argument dependent name lookup\iref{basic.lookup.argdep}. To
-preclude such an expression resulting in a call to unconstrained functions with
-the same name in namespace \tcode{std}, customization point objects specify that
-lookup for these expressions is performed in a context that includes deleted
-overloads matching the signatures of overloads defined in namespace \tcode{std}.
-When the deleted overloads are viable, user-defined overloads need be more
-specialized\iref{temp.func.order} or more constrained\iref{temp.constr.order} to
-be used by a customization point object.
+expressions with an unqualified name which results in a call to a
+program-defined function found by argument dependent name
+lookup\iref{basic.lookup.argdep}. To preclude such an expression resulting in a
+call to unconstrained functions with the same name in namespace \tcode{std},
+customization point objects specify that lookup for these expressions is
+performed in a context that includes deleted overloads matching the signatures
+of overloads defined in namespace \tcode{std}. When the deleted overloads are
+viable, program-defined overloads need be more specialized\iref{temp.func.order}
+or more constrained\iref{temp.constr.order} to be used by a customization point
+object.
 \end{note}
 
 \rSec3[functions.within.classes]{Functions within classes}

source/utilities.tex

@@ -16994,7 +16994,7 @@
  \hspace*{2ex}\tcode{basic_common_reference;}
  &
  A program may specialize this trait if at least one
- template parameter in the specialization depends on a user-defined
+ template parameter in the specialization depends on a program-defined
  type. If there is a member \tcode{type}, it shall be a
  \grammarterm{typedef-name}.
  \begin{note}