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Document and test open ranges as an alternative to a numericality validator

Instead of adding a new numericality validator (#2822), extend test
coverage and documentation for the existing :values option, which
already supports open (beginless/endless) Ranges via Range#include?.
This covers the same common cases (positive numbers, percentages,
exact values, and array element-wise checks) without a new validator.

Ref: https://github.com/ruby-grape/grape/pull/2822#issuecomment-5084586238

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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