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CMakeDependentOption: improve documentation

Ben Boeckel requested to merge ben.boeckel/cmake:CMakeDependentOption-doc-improvement into master

This makes it far clearer that <depends> is a list up front instead of burying the lede because a list is generally "trivially true" in CMake[1]. Also clarify that <force> is only available as a local variable and if queried outside of the "scope" of the cmake_dependent_option call, will get the stored user cache value.

[1] The exception being when the last entry ends in -NOTFOUND.

Suggested-by: Rui Oliveira

Backport: release

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