docs: update transform components props usage (#2283)

Co-authored-by: Federico Dainelli <[email protected]>

Author: ruddenchaux

docs/builtin/components.md

@@ -253,7 +253,7 @@ Apply scaling or transforming to elements.
 ### Usage
 
 ```md
-<Transform :scale="0.5">
+<Transform :scale="0.5" origin="top center">
   <YourElements />
 </Transform>
 ```

docs/features/transform-component.md

@@ -13,7 +13,7 @@ description: |
 The `Transform` component allows you to scale the size of the elements on your slides:
 
 ```md
-<Transform :scale="0.5">
+<Transform :scale="0.5" origin="top center">
   <YourElements />
 </Transform>
 ```