Documentation: Add real-time to core-api

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The documents explain the design concepts behind PREEMPT_RT and highlight key
differences necessary to achieve it.
It also include a list of requirements that must be fulfilled to support
PREEMPT_RT on a given architecture.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[jc: tweaked "how they differ" section head]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250815093858.930751-4-bigeasy@linutronix.de

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Sebastian Andrzej Siewior 2025-08-15 11:38:57 +02:00 • committed by Jonathan Corbet

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Documentation/core-api/index.rst

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Documentation/core-api/real-time/architecture-porting.rst

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Documentation/core-api/real-time/differences.rst

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Documentation/core-api/real-time/index.rst

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Documentation/core-api/real-time/theory.rst

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