chore(docs): update Frame props (#309)

Author: yhdesai

site/docs/guides/save-load.md

@@ -218,7 +218,7 @@ export default function App() {
           <Topbar />
           <Grid container spacing={5} style={{paddingTop: "10px"}}>
             <Grid item xs>
-              <Frame json={json}>
+              <Frame data={json}>
                 <Element is={Container} padding={5} background="#eeeeee">
                   ...
                 </Element>
@@ -237,4 +237,4 @@ export default function App() {
 ## All set! 💖
 Now, play with the editor and press the `Copy Current State` button when you are done. Refresh the page so the editor returns to its default state, then press the `Load State` button and paste the copied output - you should see the editor displaying the elements in the state from the time you copied.
 
-<Image img="tutorial/save-and-load.gif" />
+<Image img="tutorial/save-and-load.gif" />