Remove `info(rms)` from the cheatsheet

[ablaom]

The info method can no longer be called on a measure. One can just do ?rms if you know the name of the measure or an alias, and you can do measures("rms") do search for those measures with "rms" in the doc-string. See also https://juliaai.github.io/StatisticalMeasures.jl/dev/tools/#StatisticalMeasures.measures

[ablaom]

cc @abhro Maybe you can include this.

[abhro]

Done in 18e9c9f!

[ablaom]

Thank you 🙏🏾

[ablaom]

There's a second place it occurs:

https://github.com/JuliaAI/MLJ.jl/blob/18e9c9ff1208623de170c6302c033ae45c551bc4/docs/src/mlj_cheatsheet.md?plain=1#L299