doc/aws: Add space before the k8s slack url

[tungbq]

Minor updates in docs/getting_started/aws.md by adding a space before the opening parenthesis in "Slack(http://slack.k8s.io/)"

Current view:
https://kops.sigs.k8s.io/getting_started/aws/#feedback

New change from this PR:

[linux-foundation-easycla]

• ✅login: tungbq / (f6b9b05)

The committers listed above are authorized under a signed CLA.

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Hi @tungbq. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

Thanks @tungbq!

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