bug#75366: [PATCH] Improve the doc of key-valid-p

[Hong Xu <hong@topbug.net>]

* lisp/keymap.el (key-valid-p): Add an function key example.  Mention
<left> as a cursor control key instead of a function key.  Rename
some "characters" to "key strokes" to be consistent with the terminology
in the first paragraph.  Briefly explain what an event may be.
---
 lisp/keymap.el | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/lisp/keymap.el b/lisp/keymap.el
index 3aed1d4b4cac..e447bf648a10 100644
--- a/lisp/keymap.el
+++ b/lisp/keymap.el
@@ -327,21 +327,23 @@ key-valid-p
 with a single space character separating one key stroke from another.
 
 Each key stroke is either a single character, or the name of an
-event, surrounded by angle brackets <like-this>.  In addition, any
-key stroke may be preceded by one or more modifier keys.  Finally,
-a limited number of characters have a special shorthand syntax.
+event, surrounded by angle brackets <like-this>.  An event may be a key
+stroke or a menu item.  In addition, any key stroke may be preceded by
+one or more modifier keys.  Finally, a limited number of key strokes
+have a special shorthand syntax.
 
 Here are some example of valid key sequences.
 
   \"f\"           (the key `f')
+  \"<f6>\"        (the function key named \"F6\")
   \"S o m\"       (a three-key sequence of the keys `S', `o' and `m')
   \"C-c o\"       (a two-key sequence: the key `c' with the control modifier
                  followed by the key `o')
-  \"H-<left>\"    (the function key named \"left\" with the hyper modifier)
+  \"H-<left>\"    (the cursor control key named \"left\" with the hyper modifier)
   \"M-RET\"       (the \"return\" key with a meta modifier)
   \"C-M-<space>\" (the \"space\" key with both the control and meta modifiers)
 
-These are the characters that have special shorthand syntax:
+These key strokes have special shorthand syntax:
 NUL, RET, TAB, LFD, ESC, SPC, DEL.
 
 Modifiers have to be specified in this order:
-- 
2.47.1