chore: rename script

Author: marshallswain

package.json

@@ -12,10 +12,10 @@
   "private": false,
   "scripts": {
     "serve": "vue-cli-service serve ./example/main.js --open --mode local",
-    "build:doc": "vue-cli-service build ./example/main.js --dest docs --mode development",
+    "build:docs": "vue-cli-service build ./example/main.js --dest docs --mode development",
     "build": "vue-cli-service build --name vuedraggable --entry ./src/vuedraggable.js --target lib",
     "lint": "vue-cli-service lint src example",
-    "prepublishOnly": "npm run lint && npm run test:unit && npm run build:doc && npm run build:type && npm run build",
+    "prepublishOnly": "npm run lint && npm run test:unit && npm run build:docs && npm run build:type && npm run build",
     "test:unit": "vue-cli-service test:unit --coverage",
     "test:coverage": "vue-cli-service test:unit --coverage --verbose && codecov",
     "build:type": "tsc"