chore: Fix markdown lint errors and add upgrade @aklinker1/check to

include markdownlint

Author: aklinker1

.github/workflows/validate.yml

@@ -23,9 +23,6 @@ jobs:
       - name: Basic Checks
         run: pnpm check
 
-      - name: Markdownlint
-        run: pnpm check:md
-
   builds:
     name: Builds
     runs-on: ubuntu-22.04

docs/guide/resources/upgrading.md

@@ -54,8 +54,10 @@ See <https://github.com/wxt-dev/wxt/issues/784>
 To upgrade, you have two options:
 
 1. **Stop using the polyfill**
+
    - If you're already using `extensionApi: "chrome"`, then you're not using the polyfill and there is nothing to change!
    - Otherwise there is only one change: `browser.runtime.onMessage` no longer supports using promises to return a response:
+
      ```ts
      browser.runtime.onMessage.addListener(async () => { // [!code --]
        const res = await someAsyncWork(); // [!code --]
@@ -67,6 +69,7 @@ To upgrade, you have two options:
        return true; // [!code ++]
      });
      ```
+
 2. **Continue using the polyfill** - If you want to keep using the polyfill, you can! One less thing to worry about during this upgrade.
 
    - Install `webextension-polyfill` and WXT's [new polyfill module](https://www.npmjs.com/package/@wxt-dev/webextension-polyfill):

package.json

@@ -7,7 +7,6 @@
   "packageManager": "pnpm@10.10.0",
   "scripts": {
     "check": "check && pnpm -r --sequential run check",
-    "check:md": "markdownlint .",
     "test": "pnpm -r --sequential run test run",
     "test:coverage": "pnpm -r --sequential run test:coverage",
     "prepare": "simple-git-hooks",
@@ -19,7 +18,7 @@
   },
   "devDependencies": {
     "@aklinker1/buildc": "^1.1.4",
-    "@aklinker1/check": "2.0.0",
+    "@aklinker1/check": "^2.1.0",
     "@commitlint/config-conventional": "^19.8.0",
     "@commitlint/types": "^19.8.0",
     "@types/fs-extra": "^11.0.4",