Trufflehog (secrets scanner) complains on high entropy string in session.md docs

[yury-fedotov]

Description

As a contributor to kedro, running make secret-scan throws error:

And it complains on this I guess:

For example, this is how Kedro handle this in `ParallelRunner`(https://github.com/kedro-org/kedro/blob/9e883e6a0ba40e3db4497b234dcb3801258e8396/kedro/runner/parallel_runner.py#L84-L85)

Context

I think we can safely make this hyperlink target main branch instead of specific commit, and that would get rid of huge hash.