Update application.md (#2138)

* Update application.md

Mention [Augmenting Global Properties](https://vuejs.org/guide/typescript/options-api.html#augmenting-global-properties) under `app.config.globalProperties`. This guide is really hard to find, because it is in Options API section, while it actually has uses in Composition API as well.

* Update src/api/application.md

Co-authored-by: skirtle <[email protected]>

Co-authored-by: skirtle <[email protected]>

Author: Heniker

src/api/application.md

@@ -522,6 +522,8 @@ An object that can be used to register global properties that can be accessed on
     }
   }
   ```
+  
+- **See also:** [Guide - Augmenting Global Properties](/guide/typescript/options-api.html#augmenting-global-properties) <sup class="vt-badge ts" />
 
 ## app.config.optionMergeStrategies {#app-config-optionmergestrategies}