chore(docs): Update missing @aztec/accounts missing import in testing…

….md (#3903)

Missed an update with this
[PR](#3844).

Relevant
[reference](https://docs.aztec.network/apis/accounts/modules/testing).

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
the PR is ready to merge.
- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [x] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [x] Every change is related to the PR description.
- [ ] I have
[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
this pull request to relevant issues (if any exist).

Co-authored-by: Cat McGee <helloworld@mcgee.cat>

docs/docs/dev_docs/tutorials/writing_dapp/testing.md

@@ -27,10 +27,10 @@ import {
   Fr,
   Note,
   computeMessageSecretHash,
-  createAccount,
   createPXEClient,
   waitForPXE,
 } from "@aztec/aztec.js";
+import { createAccount } from '@aztec/accounts/testing';
 import { TokenContractArtifact } from "@aztec/noir-contracts/Token";
 
 const {