fix(steps/09/README.md): Correct term ComponentContainer and add missing convention

Author: flovogt

steps/09/README.md

@@ -129,7 +129,7 @@ We take out the creation of the view and create a new `ComponentContainer` inste
 
 -   For better loading performance, we set the `async` property to "true". This allows the component and its dependencies to load in the background without blocking other parts of the application. 
 
-Finally, we position our newly created ComponentController control within the HTML element with the id `content`.
+Finally, we position our newly created `ComponentContainer` control within the HTML element with the id `content`.
 
 ```ts
 import ComponentContainer from "sap/ui/core/ComponentContainer";
@@ -153,6 +153,8 @@ new ComponentContainer({
 
 -   Together with all UI assets of the app, the component is located in the `webapp` folder.
 
+-   The `index.html` file is located in the `webapp` folder if it is used productively.
+
  
 
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