docs: admin-guide: hw_random: Make document title more generic and concise

The hw_random subsystem no longer works only on specific Intel chipsets;
make the title of hw_random.rst reflect this fact.

While we're at it, also remove the words "Linux support for", since it's
clear from context that this is a document about Linux.

Signed-off-by: Jonathan Neuschäfer <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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