docs: update content

Author: mrholek

docs/4.0/getting-started/introduction.mdx

@@ -36,7 +36,7 @@ React components are styled using `@coreui/coreui` CSS library, but you can use
 ###### Installation
 
 ```bash
-npm install @coreui/coreui@next
+npm install @coreui/coreui
 ```
 
 ###### Basic usage
@@ -50,7 +50,7 @@ import '@coreui/dist/css/coreui.min.css'
 ###### Installation
 
 ```bash
-npm install bootstrap@next
+npm install bootstrap
 ```
 
 ###### Basic usage