ADD eldoc section

This is a built-in package which we are updating for eglot.
This requires some emacs-fu which I found on the elpaca github.

config.org

@@ -61,6 +61,43 @@
 (elpaca-wait)
 #+end_src
 
+* Built-in packages
+** Eldoc
+
+I got the following error message when loading eglot:
+#+BEGIN_SRC
+eglot                          failed               eldoc installed version (1 13 0) lower than min required 1.14.0                  00.239351
+#+END_SRC
+
+So install the eldoc package to be sure we have the latest version.
+But after installing it, we get a new warning:
+
+#+BEGIN_SRC
+⛔ Warning (emacs): eldoc loaded before Elpaca activation
+#+END_SRC
+
+This seemed tricker than expected, but found a solution in the github issues of elpaca:
+https://github.com/progfolio/elpaca/issues/236
+
+#+BEGIN_SRC emacs-lisp
+(use-package eldoc
+  :preface
+  ;; avoid loading of built-in eldoc, see https://github.com/progfolio/elpaca/issues/236#issuecomment-1879838229
+  (unload-feature 'eldoc t)
+  (setq custom-delayed-init-variables '())
+  (defvar global-eldoc-mode nil)
+  :demand t
+  :config
+  (global-eldoc-mode))
+
+#+END_SRC
+** Wait for loading updated packages
+
+Wait until updated built-in packages are fully loaded:
+#+BEGIN_SRC emacs-lisp
+(elpaca-wait)
+#+END_SRC
+
 * General config
 
 ** Bell