Make it easier to find results docs

[bobcatfish]

Changes

Whenever I look for results docs on this page I get confused - "storing execution results" sounds to me like it has to with the results store work (#454).

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[tekton-robot]

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[tekton-robot]

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[ghost]

💯

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[ghost]

/kind documentation

[tekton-robot]

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[jlpettersson]

/lgtm