[stmt.return,dcl.fct.def.coroutine] Avoid use of 'glvalue result' (#4803)

Author: jensmaurer

source/declarations.tex

@@ -6467,7 +6467,7 @@
 \pnum
 The expression \tcode{\exposid{promise}.get_return_object()} is used
 to initialize
-the glvalue result or prvalue result object of a call to a coroutine.
+the returned reference or prvalue result object of a call to a coroutine.
 The call to \tcode{get_return_object}
 is sequenced before
 the call to \tcode{initial_suspend}

source/statements.tex

@@ -815,7 +815,8 @@
 in a function whose return type is not \cv{}~\keyword{void};
 \indextext{conversion!return type}%
 the \tcode{return} statement initializes the
-glvalue result or prvalue result object of the (explicit or implicit) function call
+returned reference or prvalue result object
+of the (explicit or implicit) function call
 by copy-initialization\iref{dcl.init} from the operand.
 \begin{note}
 A \tcode{return} statement can involve