docs: update docs/usage.md

Author: Amr Abdelkader

docs/usage.md

@@ -38,31 +38,37 @@ methods: {
 
 ### Cancel token
 
-You can cancel a request using a *cancel token*.
+You can cancel a request using a _cancel token_.
 
 > The axios cancel token API is based on the withdrawn [cancelable promises proposal](https://github.com/tc39/proposal-cancelable-promises).
 
 You can create a cancel token using the `CancelToken.source` factory as shown below:
 
 ```js
-const CancelToken = this.$axios.CancelToken;
-const source = CancelToken.source();
+const { CancelToken } = this.$axios;
+const source = this.$axios.CancelToken.source();
 
-this.$axios.$get('/user/12345', {
-  cancelToken: source.token
-}).catch(function (thrown) {
-  if (this.$axios.isCancel(thrown)) {
-    console.log('Request canceled', thrown.message);
-  } else {
-    // handle error
-  }
-});
-
-this.$axios.$post('/user/12345', {
-  name: 'new name'
-}, {
-  cancelToken: source.token
-})
+this.$axios
+  .$get('/user/12345', {
+    cancelToken: source.token,
+  })
+  .catch(error => {
+    if (this.$axios.isCancel(error)) {
+      console.log('Request canceled', error);
+    } else {
+      // handle error
+    }
+  });
+
+this.$axios.$post(
+  '/user/12345',
+  {
+    name: 'new name',
+  },
+  {
+    cancelToken: source.token,
+  },
+);
 
 // cancel the request (the message parameter is optional)
 source.cancel('Operation canceled by the user.');
@@ -71,14 +77,14 @@ source.cancel('Operation canceled by the user.');
 You can also create a cancel token by passing an executor function to the `CancelToken` constructor:
 
 ```js
-const CancelToken = this.$axios.CancelToken;
+const { CancelToken } = this.$axios;
 let cancel;
 
 this.$axios.$get('/user/12345', {
-  cancelToken: new CancelToken(function executor(c) {
+  cancelToken: new CancelToken(c => {
     // An executor function receives a cancel function as a parameter
     cancel = c;
-  })
+  }),
 });
 
 // cancel the request