[Docs] Just some documentation problem

[OmBiradar]

Describe the enhancement requested

https://arrow.apache.org/docs/cpp/memory.html#:~:text=device.-,Each%20device%20has%20a%20default%20memory%20manager%2C%20but%20additional%20instances%20may%20be%20constructed%20(for%20example%2C%20wrapping%20a%20custom%20arrow::MemoryPool%20the%20CPU).%20arrow::MemoryManager%20instances%20which%20specify%20how%20to%20allocate%20memory%20on%20a%20given%20device%20(for%20example%2C%20using%20a%20particular%20arrow::MemoryPool%20on%20the%20CPU).,-Device

There is just some small things missing from these 2 lines which is making it kinda hard to understand exactly. Would be great if it could be fixed by someone who knows what it should have ment.

Component(s)

Documentation

[OmBiradar]

@ianmcook

[thisisnic]

@OmBiradar Are you OK to update the title and description of this issue to have a bit more specific detail - what are you trying to work out, and what doesn't quite make sense? It's hard to tell from the current description.