[dcl.attr.deprecated], [cpp.error] Replace "diagnostic message" with "warning"

Author: eisenwave

source/declarations.tex

@@ -9598,9 +9598,10 @@
 
 \pnum
 \recommended
-Implementations should use the \tcode{deprecated} attribute to produce a diagnostic
-message in case the program refers to a name or entity other than to declare it, after a
-declaration that specifies the attribute. The diagnostic message should include the text provided
+Implementations should use the \tcode{deprecated} attribute to produce a warning
+in case the program refers to a name or entity other than to declare it, after a
+declaration that specifies the attribute.
+The warning should include the text provided
 within the \grammarterm{attribute-argument-clause} of any \tcode{deprecated} attribute applied
 to the name or entity.
 The value of

source/preprocessor.tex

@@ -2098,7 +2098,7 @@
 \begin{ncsimplebnf}
 \terminal{\# warning} \opt{pp-tokens} new-line
 \end{ncsimplebnf}
-requires the implementation to produce at least one diagnostic message
+requires the implementation to produce at least one warning
 for the preprocessing translation unit\iref{intro.compliance.general}.
 \recommended
 Any diagnostic message caused by either of these directives