Per #790, #590: Adjust last commit about workspace configuration

* README.md (way): Adjust.

* eglot.el (json): Don't require needlessly.
(eglot-show-workspace-configuration): Don't depend on json-mode.

README.md

@@ -141,9 +141,7 @@ out-of-the-box, but some need to know project-specific settings, which
 LSP calls "workspace configuration".
 
 These per-project settings are realized with the Elisp variable
-`eglot-workspace-configuration`.
-
-This variable's value is sent over to the server:
+`eglot-workspace-configuration`.  They are sent over to the server:
 
 * initially, as a [`didChangeConfiguration` notification][did-change-configuration];
 * as the response to [configuration request][configuration-request] from the server.

eglot.el

@@ -74,7 +74,6 @@
 (require 'filenotify)
 (require 'ert)
 (require 'array)
-(require 'json)
 
 ;; ElDoc is preloaded in Emacs, so `require'-ing won't guarantee we are
 ;; using the latest version from GNU Elpa when we load eglot.el.  Use an
@@ -2222,8 +2221,7 @@ format described above.")
       (insert (jsonrpc--json-encode conf))
       (with-no-warnings
         (require 'json)
-        (require 'json-mode)
-        (json-mode)
+        (when (require 'json-mode nil t) (json-mode))
         (json-pretty-print-buffer))
       (pop-to-buffer (current-buffer)))))