Check docs and overrides with GitHub actions

.github/workflows/lint.yml

@@ -4,12 +4,12 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: '16'
       - run: npm install -g markdownlint-cli@0.23.2
       - run: markdownlint '**/*.md' --ignore node_modules

.github/workflows/overrides.yml

@@ -0,0 +1,18 @@
+name: Check Docs & Overrides
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '16'
+      - run: npm install
+      - name: Check Docs
+        run: npm run export:docs
+      - name: Check Overrides
+        run: npm run export:overrides

docs/kv.md

@@ -1,3 +1,5 @@
+# KV
+
 ## `KVNamespace`
 
 Workers KV is a global, low-latency, key-value data store. It supports exceptionally high read volumes with low-latency,