docs - remaining instances of var and imports (#7)

* docs - remaining instances of var and imports

* docs - revert extraneous apostrophes

API.md

@@ -36,11 +36,11 @@ Create a new router.
 Basic usage:
 
 ```javascript
-var Koa = require('koa');
-var Router = require('koa-router');
+const Koa = require('koa');
+const Router = require('@koa/router');
 
-var app = new Koa();
-var router = new Router();
+const app = new Koa();
+const router = new Router();
 
 router.get('/', (ctx, next) => {
   // ctx.router available
@@ -244,11 +244,11 @@ with `405 Method Not Allowed` and `501 Not Implemented` as appropriate.
 
 **Example**  
 ```javascript
-var Koa = require('koa');
-var Router = require('koa-router');
+const Koa = require('koa');
+const Router = require('@koa/router');
 
-var app = new Koa();
-var router = new Router();
+const app = new Koa();
+const router = new Router();
 
 app.use(router.routes());
 app.use(router.allowedMethods());
@@ -257,12 +257,12 @@ app.use(router.allowedMethods());
 **Example with [Boom](https://github.com/hapijs/boom)**
 
 ```javascript
-var Koa = require('koa');
-var Router = require('koa-router');
-var Boom = require('boom');
+const Koa = require('koa');
+const Router = require('@koa/router');
+const Boom = require('boom');
 
-var app = new Koa();
-var router = new Router();
+const app = new Koa();
+const router = new Router();
 
 app.use(router.routes());
 app.use(router.allowedMethods({
@@ -393,6 +393,6 @@ Generate URL from url pattern and given `params`.
 
 **Example**  
 ```javascript
-var url = Router.url('/users/:id', {id: 1});
+const url = Router.url('/users/:id', {id: 1});
 // => "/users/1"
 ```

lib/layer.js

@@ -103,7 +103,7 @@ Layer.prototype.captures = function (path) {
  * @example
  *
  * ```javascript
- * var route = new Layer(['GET'], '/users/:id', fn);
+ * const route = new Layer(['GET'], '/users/:id', fn);
  *
  * route.url({ id: 123 }); // => "/users/123"
  * ```

lib/router.js

@@ -40,7 +40,7 @@ module.exports = Router;
  *   .use(router.allowedMethods());
  * ```
  *
- * @alias module:@koa/router
+ * @alias module:koa-router
  * @param {Object=} opts
  * @param {String=} opts.prefix prefix router paths
  * @constructor
@@ -141,8 +141,8 @@ function Router(opts) {
  * Nesting routers is supported:
  *
  * ```javascript
- * var forums = new Router();
- * var posts = new Router();
+ * const forums = new Router();
+ * const posts = new Router();
  *
  * posts.get('/', (ctx, next) => {...});
  * posts.get('/:pid', (ctx, next) => {...});
@@ -157,7 +157,7 @@ function Router(opts) {
  * Route paths can be prefixed at the router level:
  *
  * ```javascript
- * var router = new Router({
+ * const router = new Router({
  *   prefix: '/users'
  * });
  *
@@ -180,7 +180,7 @@ function Router(opts) {
  * used to convert paths to regular expressions.
  *
  * @name get|put|post|patch|delete|del
- * @memberof module:koa-router.prototype
+ * @memberof module:@koa-router.prototype
  * @param {String} path
  * @param {Function=} middleware route middleware(s)
  * @param {Function} callback route callback
@@ -364,11 +364,11 @@ Router.prototype.routes = Router.prototype.middleware = function () {
  * @example
  *
  * ```javascript
- * var Koa = require('koa');
- * var Router = require('koa-router');
+ * const Koa = require('koa');
+ * const Router = require('@koa/router');
  *
- * var app = new Koa();
- * var router = new Router();
+ * const app = new Koa();
+ * const router = new Router();
  *
  * app.use(router.routes());
  * app.use(router.allowedMethods());
@@ -377,12 +377,12 @@ Router.prototype.routes = Router.prototype.middleware = function () {
  * **Example with [Boom](https://github.com/hapijs/boom)**
  *
  * ```javascript
- * var Koa = require('koa');
- * var Router = require('koa-router');
- * var Boom = require('boom');
+ * const Koa = require('koa');
+ * const Router = require('@koa/router');
+ * const Boom = require('boom');
  *
- * var app = new Koa();
- * var router = new Router();
+ * const app = new Koa();
+ * const router = new Router();
  *
  * app.use(router.routes());
  * app.use(router.allowedMethods({
@@ -719,7 +719,7 @@ Router.prototype.param = function (param, middleware) {
  * @example
  *
  * ```javascript
- * var url = Router.url('/users/:id', {id: 1});
+ * const url = Router.url('/users/:id', {id: 1});
  * // => "/users/1"
  * ```
  *