doc: blk-ioprio: Bring the doc in line with the implementation

Our system administrator have noted that the names 'rt-to-be' and
'all-to-idle' in the I/O priority policies table appeared without
explanations, leading to confusion. Let's bring these names in line
with the naming in the 'attribute' section.

Additionally,
1. Correct the interface name to 'io.prio.class'.
2. Add a table entry of 'promote-to-rt' for consistency.
3. Fix a typo of 'priority'.

Suggested-by: Yingfu Zhou <[email protected]>
Reviewed-by: Hou Tao <[email protected]>
Signed-off-by: Tang Yizhou <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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