Small docs fix to make the timeout field value more obvious.

[pierretasci]

Changes

Reorders the docs for PipelineRuns and TaskRuns to mention the global default timeout after the regular timeout field. This is because the timeout field expects a Go-style durations string but the global config expects an integer number of minutes. The way it is ordered currently can make someone think that the global config expects a duration string (source: I made this mistake 😄 )

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Release Notes

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[pierretasci]

/kind documentation

[lbernick]

thanks Pierre!

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[jerop]

/lgtm