Document 'describe-symbol'

* doc/emacs/help.texi (Help Summary): Mention "C-h o".
(Name Help): Document "C-h o" and describe-symbol.

* lisp/help-fns.el (describe-symbol): Doc fix.

1 files changed, 12 insertions, 0 deletions

diff --git a/doc/emacs/help.texi b/doc/emacs/help.texi
index a9c63b91785..8b4adf947ef 100644
--- a/doc/emacs/help.texi
+++ b/doc/emacs/help.texi
@@ -126,6 +126,10 @@ Display documentation of the current major mode and minor modes
 (@code{describe-mode}).
 @item C-h n
 Display news of recent Emacs changes (@code{view-emacs-news}).
+@item C-h o @var{symbol}
+Display documentation of the Lisp symbol named @var{symbol}
+(@code{describe-symbol}).  This will show the documentation of all
+kinds of symbols: functions, variables, and faces.
 @item C-h p
 Find packages by topic keyword (@code{finder-by-keyword}).  This lists
 packages using a package menu buffer.  @xref{Packages}.
@@ -272,6 +276,14 @@ source files installed (@pxref{Hyperlinking}).
 (@code{Info-goto-emacs-command-node}).  This knows about various
 manuals, not just the Emacs manual, and finds the right one.
 
+@kindex C-h o
+@findex describe-symbol
+  @kbd{C-h o} (@code{describe-symbol}) is like @kbd{C-h f} and
+@kbd{C-h v}, but it describes any symbol, be it a function, a
+variable, or a face.  If the symbol has more than one definition, like
+it has both definition as a function and as a variable, this command
+will show the documentation of all of them, one after the other.
+
 @node Apropos
 @section Apropos
 @cindex apropos