Update package name from 'Complex Table' to 'Complex Tree' (#438)

Author: mgatgithub

packages/docs/docs/getstarted.mdx

@@ -23,7 +23,7 @@ stay up to date.
 
 ## Installation
 
-To start using React Complex Table, install it to your project as a dependency via
+To start using React Complex Tree, install it to your project as a dependency via
 
 ```
 npm install react-complex-tree
@@ -253,4 +253,4 @@ function App() {
     </UncontrolledTreeEnvironment>
   );
 }
-```
+```