ARROW-13137: [C++][Documentation] Make in-table references consistent
ARROW-13137: [C++][Documentation] Make in-table references consistent

Updated `compute.rst` adding Notes column where needed and unifying raw syntax for in-table references.

Closes #10630 from AlenkaF/ARROW-13137

Authored-by: Alenka Frim <f50e75d4c31e511ffacbf2da8f53d7ed4bd8eabe@gmail.com>
Signed-off-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>

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