[docs] Fixed typos and formatting (#19546)

## Description 

- Use `move` instead of `rust` for some code blocks
- Fix alignment in `conventions.md` with standard 4 spaces
- Fix minor formatting issues elsewhere

docs/content/concepts/events.mdx

@@ -75,7 +75,7 @@ module examples::donuts_with_events {
 
         // Emit the event using future object's ID.
         event::emit(DonutBought { id: object::uid_to_inner(&id) });
-       Donut { id }
+        Donut { id }
     }
 
     /// Consume donut and get nothing...
@@ -104,4 +104,4 @@ module examples::donuts_with_events {
 
 ## Related links
 
-- [Using Events](/guides/developer/sui-101/using-events.mdx): A guide to leveraging Sui events in your smart contracts.
+- [Using Events](/guides/developer/sui-101/using-events.mdx): A guide to leveraging Sui events in your smart contracts.