[Emacs] Add lsp-ltex, add doc for writegood-mode

org/config/emacs.org

@@ -6041,6 +6041,30 @@ in quite a few languages.
     "p" #'langtool-show-message-at-point))
 #+end_src
 
+An LSP version of LanguageTools is also available:
+#+begin_src emacs-lisp
+(use-package lsp-ltex
+  :defer t
+  :straight (:build t)
+  :after lsp-mode
+  :hook (text-mode . lsp-deferred)
+  :init
+  (setq lsp-ltex-java-force-try-system-wide t
+        lsp-ltex-server-store-path nil
+        lsp-ltex-version (gethash "ltex-ls"
+                                  (json-parse-string
+                                   (replace-regexp-in-string
+                                    (rx "Picked" (* any) "\n")
+                                    ""
+                                    (shell-command-to-string "ltex-ls -V"))))
+        lsp-ltex-check-frequency "save"
+        lsp-ltex-language "auto"
+        lsp-ltex-mother-tongue "fr"))
+#+end_src
+
+Finally, =writegood-mode= detects some simple general rules when writing
+in English and can also calculate the Flesh-Kincaid levels of a
+document.
 #+begin_src emacs-lisp
 (use-package writegood-mode
   :defer t