Remove `info(rms)` from the cheatsheet

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