docs: remove duplicate content in subtitle/body (#460)

Author: Austin Gil

docs/content/en/getting-started/gotchas.md

@@ -1,14 +1,12 @@
 ---
 title: Gotchas
-description: 'There are a couple of key points to remember when using the composition API.'
+description: 'There are a couple of points that you should be aware of when using `@nuxtjs/composition-api`.'
 category: Getting started
 fullscreen: True
 position: 3
 version: 0.133
 ---
 
-There are a couple of points that you should be aware of when using `@nuxtjs/composition-api`.
-
 ## **'Keyed' functions**
 
 A number of helper functions use a key to pass JSON-encoded information from server to client (currently `shallowSsrRef`, `ssrPromise`, `ssrRef` and `useAsync`).