fix: Fix example in emit_events

[stoobie]

Description of the Changes

This PR fixes #1124.

1. The syscall emit_event example is incorrect, and the problem noted in num 2 also applies here.

2. https://docs.starknet.io/documentation/architecture_and_concepts/Smart_Contracts/starknet-events/

   The above code emits an event with two keys, the strings “status” and “deposit”

   The code shown actually uses “key” and “deposit” as keys

PR Preview URL

Events emit_event

Check List

• [x] Changes have been done against main branch, and PR does not conflict
• [x] PR title follows the convention: <docs/feat/fix/chore>(optional scope): <description>, e.g: fix: minor typos in code

---

This change is 

[github-actions[bot]]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1169/documentation/ .

[github-actions[bot]]

Your preview build is ready! ✨ Check the following link in 1-2 minutes: https://starknet-io.github.io/starknet-docs/pr-1169/documentation/ .