docs: add information about enriching events (#473)

Author: rchl

docs/content/en/guide/usage.md

@@ -1,30 +1,41 @@
 ---
-title: Usage
-description: 'Usage of Sentry into Nuxt'
+title: Usage / API
+description: 'Usage of Sentry in Nuxt'
 position: 3
 category: Guide
 ---
 
-Enter your DSN in the Nuxt.js config file. Additional config options can be found [here](https://docs.sentry.io/platforms/javascript/guides/vue/configuration/options/).
-
 ### Automatic Capturing
-Once installed, Sentry automatically reports errors, uncaught exceptions, and unhandled rejections. No need for further steps, unless you like to report (certain) exceptions manually (or have deactivated integrations like 'GlobalError'). In this case, find below how to send reports manually. 
+
+Once enabled, Sentry automatically reports errors, uncaught exceptions and unhandled rejections. No need for further steps, unless you like to report (certain) exceptions manually or have deactivated integrations like `GlobalError`. In this case, find out below how to send reports manually.
+
+### Enriching Reported Events
+
+Sentry SDK provides API for enhancing events that are being reported. For example, you can:
+  - set user information like IP address or username using `Sentry.setUser` API
+  - add custom structured data using `Sentry.setContext` API
+  - set custom key/value pairs (tags) that get indexed and can be used for filtering and searching using `Sentry.setTag` API
+  - add file attachments using `scope.addAttachment` API
+  - manually add breadcrumbs using `Sentry.addBreadcrumb` API
+  - and other...
+
+Read more about [Enriching Events](https://docs.sentry.io/platforms/javascript/guides/vue/enriching-events/).
 
 ### Usage in Vue components
 
 In a Vue component, `Sentry` is available as `this.$sentry`, so we can call functions like
 
-``` js
+```js
 this.$sentry.captureException(new Error('example'))
 ```
 
 where `this` is a Vue instance.
 
 ### Usage in `asyncData`
 
-While using Nuxt's `asyncData` method, there's `$sentry` object in the `context`:
+While using Nuxt's `asyncData` method, there's `$sentry` object in the `context` object:
 
-``` js
+```js
 async asyncData ({ params, $sentry }) {
   try {
     let { data } = await axios.get(`https://my-api/posts/${params.id}`)
@@ -37,7 +48,7 @@ async asyncData ({ params, $sentry }) {
 
 ### Usage in server middleware
 
-Sentry instance is accessible through the `process.sentry`.
+Server Sentry instance is accessible through `process.sentry`.
 
 ### Usage in other lifecycle areas