Briefl SLY document for variables without value output

[li-yiyang]

When using sly-describe-symbol, it will use builtin describe in backend. However, if describing a list with tons of data (in my case, a 34MB in text), this will break the SLY connection (or crash Emacs).

I change the documentation function to something like this:

   (let ((type (plist-get candidate :icon))
	  (key  (plist-get candidate :key)))
      (pcase type
	((or "function" "method" "operator")
	 (sly-eval `(slynk:describe-function ,key)))
	;; use slynk-apropos::briefly-describe-symbol-for-emacs
	;; for variable (make sure it won't print too much of its value).
	((or "variable")
	 (sly-eval
	    `(slynk::with-buffer-syntax
	      ()
	      (cl:format cl:nil "~A"
			 (cl:getf (slynk-apropos::briefly-describe-symbol-for-emacs
				   (slynk::parse-symbol-or-lose ,key) cl:nil)
				  :variable)))))
	(_
	 (sly-eval `(slynk:describe-symbol ,key))))

which use slynk-apropos::briefly-describe-symbol-for-emacs and it was fine to use.

I wander if there's some way to make it more neatly.