[lsp-ui-doc] Add option to disable markdown formatting (#612)

Attempt to address #611

Co-authored-by: Jen-Chieh Shen <jcs090218@gmail.com>

lsp-ui-doc.el

@@ -146,6 +146,11 @@ option."
   :type 'boolean
   :group 'lsp-ui-doc)
 
+(defcustom lsp-ui-doc-enhanced-markdown t
+  "Lsp-ui-doc will attempt to better format the markdown documentation."
+  :type 'boolean
+  :group 'lsp-ui-doc)
+
 (defcustom lsp-ui-doc-text-scale-level 0
   "Text scale amount for doc buffer."
   :type 'integer
@@ -694,7 +699,7 @@ FN is the function to call on click."
            'lsp-ui-doc--webkit-resize-callback))
       (erase-buffer)
       (insert (s-trim string))
-      (unless (lsp-ui-doc--inline-p)
+      (unless (or (lsp-ui-doc--inline-p) (not lsp-ui-doc-enhanced-markdown))
         (lsp-ui-doc--fill-document)
         (lsp-ui-doc--make-smaller-empty-lines)
         (lsp-ui-doc--handle-hr-lines))