fix(docs): updated docs for wishlist plugin

[Rana-Faraz]

added await to db query causing the value to be promise and causing server crash

Issue#2868

Description

If you run the addToWhishlist mutation twice then the server crashes with the error:

if (this.isReleased) throw new QueryRunnerAlreadyReleasedError()
                                  ^
QueryRunnerAlreadyReleasedError: Query runner already released. Cannot run queries anymore.

in simple words

If the variant is already in the wishlist and you run the mutation again (trying to add a variant to wishlist when that variant is already in the wishlist) the server crashes.

Breaking changes

No breaking changes.

Checklist

📌 Always:

• I have set a clear title
• My PR is small and contains a single feature
• I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

[vercel]

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Nov 27, 2024 0:25am

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Rana-Faraz]

I have read the CLA Document and I hereby sign the CLA

[michaelbromley]

thank you!