Spelling type corrected (SharePoint#882)

Frameword to Framework

Author: amalhashim777

docs/spfx/extensions/overview-extensions.md

@@ -1,6 +1,6 @@
 # Overview of SharePoint Framework Extensions
 
-You can use SharePoint Framework Extensions to extend the SharePoint user experience. With SharePoint Frameword Extensions, you can customize more facets of the SharePoint experience, including notification areas, toolbars, and list data views. SharePoint Framework Extensions are available in all Office 365 tenants for production usage. 
+You can use SharePoint Framework Extensions to extend the SharePoint user experience. With SharePoint Framework Extensions, you can customize more facets of the SharePoint experience, including notification areas, toolbars, and list data views. SharePoint Framework Extensions are available in all Office 365 tenants for production usage. 
 
 > **Note:** You can get a free Office 365 developer tenant when you subscribe to the [Office 365 Developer Program](http://dev.office.com/devprogram).