GSoC: Clarify that ASV local benchmarks do not require regression data

[dipraj02]

What does this PR do?

This PR clarifies that running ASV benchmarks locally does not require
regression data, and that regression data is only used in CI for performance
comparison between commits.

Why is this needed?

The existing documentation was unclear about whether regression data is
required for local ASV runs, which caused confusion for users running
benchmarks locally.

Related issue

Fixes #3230

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[dipraj02]

Hi @dipraj02 , are you applying to Google Summer of Code?

yes i m applying for GSoC 2026

[wkerzendorf]

please make sure to follow the instructions for GSoC PRs - closing this one now.