Improve getter names for boolean fields

From #21827 (moved):

The method name getRecommendedVersion is quite misleading - especially together with getVersion - as it returns a boolean not a version value, but as the method was introduced long ago this shouldn't halt a merge.

Maybe, the naming could be improved at some point?

So, what should we rename here? All boolean/Boolean fields in docs package classes to isXY()?

Anything else?

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