Update global-component.md

Clarify descriptions of the `ClientOnly` and `OutboundLink` global vitepress components

docs/guide/global-component.md

@@ -1,6 +1,6 @@
 # Global Component
 
-VitePress comes with few built-in component that can be used globally. You may use these components in your markdown or your custom theme configuration.
+VitePress comes with few built-in components that can be used globally. You may use these components in your markdown or your custom theme configuration.
 
 ## Content
 
@@ -17,9 +17,9 @@ The `Content` component displays the rendered markdown contents. Useful [when cr
 
 The `ClientOnly` component renderes its slot only at client side.
 
-Because VitePress applications are server-rendered in Node.js when generating static builds, any Vue usage must conform to the universal code requirements. In short, make sure to only access Browser / DOM APIs in beforeMount or mounted hooks.
+Because VitePress applications are server-rendered in Node.js when generating static builds, any Vue usage must conform to the universal code requirements. In short, make sure to only access Browser / DOM APIs in `beforeMount` or `mounted` hooks.
 
-If you are using or demoing components that are not SSR-friendly (for example, contain custom directives), you can wrap them inside the `ClientOnly` component.
+If you are using or demoing components that are not SSR-friendly (for example, components that contain [custom directives](https://vuejs.org/guide/reusability/custom-directives.html) that don't implement an [SSR transform](https://github.com/vuejs/core/issues/3298#issuecomment-785607554)), you can wrap them inside the `ClientOnly` component.
 
 ```html
 <ClientOnly>
@@ -29,4 +29,4 @@ If you are using or demoing components that are not SSR-friendly (for example, c
 
 ## OutboundLink
 
-The indicator `OutboundLink` is used to denote external links. In VitePress, this component has been followed by every external link.
+The component `OutboundLink` is used to denote external links on the page. In VitePress, this component "follows" every external link. `OutboundLink` is a small component that simply renders an SVG icon after an external link.