docs: Validate JSON snippets (settings, keymap, tasks, etc) (#40043)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

docs/src/languages/tailwindcss.md

@@ -8,18 +8,18 @@ Zed has built-in support for Tailwind CSS autocomplete, linting, and hover previ
 
 To configure the Tailwind CSS language server, refer [to the extension settings](https://github.com/tailwindlabs/tailwindcss-intellisense?tab=readme-ov-file#extension-settings) and add them to the `lsp` section of your `settings.json`:
 
-```jsonc
+```json [settings]
 {
   "lsp": {
     "tailwindcss-language-server": {
       "settings": {
         "classFunctions": ["cva", "cx"],
         "experimental": {
-          "classRegex": ["[cls|className]\\s\\:\\=\\s\"([^\"]*)"],
-        },
-      },
-    },
-  },
+          "classRegex": ["[cls|className]\\s\\:\\=\\s\"([^\"]*)"]
+        }
+      }
+    }
+  }
 }
 ```
 
@@ -40,7 +40,7 @@ Languages which can be used with Tailwind CSS in Zed:
 
 Zed supports Prettier out of the box, which means that if you have the [Tailwind CSS Prettier plugin](https://github.com/tailwindlabs/prettier-plugin-tailwindcss) installed, adding it to your Prettier configuration will make it work automatically:
 
-```json
+```json [settings]
 // .prettierrc
 {
   "plugins": ["prettier-plugin-tailwindcss"]