Correct spec documentation for GitHubSource

[johscheuer]

Correct the serviceAccountName description for the GitHubSource and fix a missing space.

[knative-prow-robot]

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[samodell]

Thanks for fixing this! Quick wording suggestion.

[johscheuer]

Thanks for your suggestion I just oriented at the other descriptions, e.g.: https://github.com/knative/docs/blob/master/eventing/README.md#containersource

[samodell]

@johscheuer

Thanks for your suggestion I just oriented at the other descriptions, e.g.: https://github.com/knative/docs/blob/master/eventing/README.md#containerso

Ah, thanks for pointing out where that came from! Let's actually leave it unchanged for now. Sorry f or the back-and-forth.

[johscheuer]

Reverted the changed :)

[samodell]

/lgtm

[knative-prow-robot]

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This pull-request has been approved by: johscheuer, samodell

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