docs(extensions): Updates the extensions landing page to add referenc…

…e to the component groups extension. (#3849)

* (docs(extensions): Updates the extensions landing page to add reference to the component groups extension.

* Update packages/documentation-site/patternfly-docs/pages/landing-pages/extensions/extensions-data.json

* typo update

packages/documentation-site/patternfly-docs/pages/landing-pages/extensions/extensions-data.json

@@ -1,12 +1,15 @@
 {
+  "component-groups": {
+    "summary": "Provides additional React components that combine multiple base PatternFly components to address more complex UI design scenarios."
+  }, 
   "catalog-view": {
     "summary": "Constructs an interface that is composed of different elements, like tiles, tabs, panels, and headers."
   },
   "log-viewer": {
     "summary": "Enables you to clearly visualize your project's log content in real time."
   },
   "quick-starts": {
-    "summary": "Creates 2 product documentation tools that provide users wiith embedded guidance and documentation: quick starts and in-app documentation."
+    "summary": "Creates 2 product documentation tools that provide users with embedded guidance and documentation: quick starts and in-app documentation."
   },
   "react-console": {
     "summary": "Provides additional React components that enable access to virtual machines or server consoles."