The Graph: cleaned up & added quickstart link

[alinobrasil]

Cleaned up documentation on The Graph:

• added link to quick-start guide
• subgraph not sub-graph
• simplified message

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[gitguardian]

️✅ There are no secrets present in this pull request anymore.

If these secrets were true positive and are still valid, we highly recommend you to revoke them.
While these secrets were previously flagged, we no longer have a reference to the
specific commits where they were detected. Once a secret has been leaked into a git
repository, you should consider it compromised, even if it was deleted immediately.
Find here more information about risks.

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

[wackerow]

Thanks @alinobrasil! Sorry for delay, but looks good, pulling in

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[wackerow]

@all-contributors please add @alinobrasil for maintenance

[allcontributors]

@wackerow

I've put up a pull request to add @alinobrasil! 🎉