For \kbd, be more prescriptive regarding how keystrokes should be
written.
diff --git a/Doc/doc/doc.tex b/Doc/doc/doc.tex
index 7069f2f..9254ebb 100644
--- a/Doc/doc/doc.tex
+++ b/Doc/doc/doc.tex
@@ -787,8 +787,13 @@
\begin{macrodesc}{kbd}{\p{key sequence}}
Mark a sequence of keystrokes. What form \var{key sequence}
takes may depend on platform- or application-specific
- conventions. For example, an \program{xemacs} key sequence
- may be marked like \code{\e kbd\{C-x C-f\}}.
+ conventions. When there are no relevant conventions, the names
+ of modifier keys should be spelled out, to improve accessibility
+ for new users and non-native speakers. For example, an
+ \program{xemacs} key sequence may be marked like
+ \code{\e kbd\{C-x C-f\}}, but without reference to a specific
+ application or platform, the same sequence should be marked as
+ \code{\e kbd\{Control-x Control-f\}}.
\end{macrodesc}
\begin{macrodesc}{keyword}{\p{name}}