docs: difference between token and gitToken

[waveywaves]

Doc request

related to #8537

[waveywaves]

/kind docs

[tekton-robot]

@waveywaves: The label(s) kind/docs cannot be applied, because the repository doesn't have them.

In response to this:

/kind docs

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[waveywaves]

/kind documentation

[senirus]

I will take this up

[waveywaves]

/assign @senirus