Add new help command describe-keymap

* lisp/help-fns.el (describe-keymap): New command to show key bindings
for a given keymap.  (Bug#30660)
* doc/emacs/help.texi (Misc Help): Document the new command.
* doc/lispref/keymaps.texi (Scanning Keymaps): Add a cross-reference
to the above documentation.
* etc/NEWS: Announce the new command.

* test/lisp/help-fns-tests.el (help-fns-test-describe-keymap/symbol)
(help-fns-test-describe-keymap/value)
(help-fns-test-describe-keymap/not-keymap)
(help-fns-test-describe-keymap/let-bound)
(help-fns-test-describe-keymap/dynamically-bound-no-file): New tests.

Co-authored-by: Drew Adams <drew.adams@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 1fbcd43ab00..de8e20e2de4 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -85,6 +85,11 @@ shows equivalent key bindings for all commands that have them.
 
 * Changes in Specialized Modes and Packages in Emacs 28.1
 
+** Help
+
++++
+*** New command 'describe-keymap' describes keybindings in a keymap.
+
 ---
 ** The old non-SMIE indentation of 'sh-mode' has been removed.