Fix a defcustom :type in eldoc.el

* lisp/emacs-lisp/eldoc.el (eldoc-echo-area-prefer-doc-buffer): Make
:type a choice, to allow for the value 'maybe'.  (Bug##66539)

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/eldoc.el b/lisp/emacs-lisp/eldoc.el
index a175edcc671..7cd676b8e50 100644
--- a/lisp/emacs-lisp/eldoc.el
+++ b/lisp/emacs-lisp/eldoc.el
@@ -132,7 +132,9 @@ documentation in the echo area if the dedicated documentation
 buffer (displayed by `eldoc-doc-buffer') is already displayed in
 some window.  If the value is the symbol `maybe', then the echo area
 is only skipped if the documentation needs to be truncated there."
-  :type 'boolean)
+  :type '(choice (const :tag "Prefer ElDoc's documentation buffer" t)
+                 (const :tag "Prefer echo area" nil)
+                 (const :tag "Skip echo area if truncating" maybe)))
 
 (defface eldoc-highlight-function-argument
   '((t (:inherit bold)))