Fix and update docs.

src/bootstrap/Alert.md

@@ -1,4 +1,5 @@
 Bootstrap alert component.
+
 ```jsx
 import {useState} from 'react';
 
@@ -7,14 +8,14 @@ function AlertExample(){
     if (alert)
         return <Alert 
             type='warning' 
-            message='Some warning out there!' 
             onDismiss={()=>setAlert(false)}
-        />;
+        >
+            Some warning out there!        
+        </Alert>;
     return <button 
         className='btn btn-secondary' 
         onClick={()=>setAlert(true)}
     >Show alert again</button>;
 };
 <AlertExample/>
-
 ```