Help: Update the main purpose of define_property()

The BRIEF_DOCS and FULL_DOCS are remnants from before the
Sphinx-based documentation when CMake's internal structures
for defining properties included fields for their documentation.
They are no longer mandatory for define_property() and haven't
been in practical use for some time. The main use of the command
has evolved to now be more about how to initialize and inherit
properties, so update the docs to reflect that change in focus.

Issue: #20698

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