docs: Added guide on how to make an entity channel aware

[Draykee]

Description

Issue #3210

• Fixed wrong link to customer group instead of customer
• Added guide on how to make an entity channel aware
• Improve the documentation of the assignToCurrentChannel helper, since it sounds like it will perform database operations

Breaking changes

Nope

Screenshots

You can add screenshots here if applicable.

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	❌ Failed (Inspect)		Nov 18, 2024 3:32pm

[github-actions]

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

[Draykee]

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

[michaelbromley]

Very nice and comprehensive guide! Just a bunch of small fixes/improvements to add.

[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

[Draykee]

Anything missing? Would love to get this merged to start delivering the guide for translateables

[Draykee]

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

[michaelbromley]

recheck

[michaelbromley]

Looks like there are broken links: https://vercel.com/vendure/docs/Pt79zh5qPKN27xgjmhATpQLwiX5p?filter=errors

Run npm run build from the docs dir locally and you'll see them too.