Merge changes Ib172b554,I9971fd47 into integration

* changes:
docs(per-cpu): clean up NUMA docs
fix(per-cpu): remove redundant casts

docs(per-cpu): clean up NUMA docs

This change incorporates resolutions for the remaining code review
comments on the NUMA documentation, which were intentionally left
unresolved when the NUMA stack

docs(per-cpu): clean up NUMA docs

This change incorporates resolutions for the remaining code review
comments on the NUMA documentation, which were intentionally left
unresolved when the NUMA stack was expedited.

Additionally, general improvements include:

- Documentation has been re-flowed with Pandoc;
- Diagram file-names follow naming conventions;
- Diagram alt-text better reflects the image content;
- Diagram widths scale with the content body width; and
- Grammar and spelling follow American English.

Change-Id: Ib172b554347caa8a72229081682b07fdb6417b64
Signed-off-by: Chris Kay <chris.kay@arm.com>

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