Design doc: Add note about on-disk locations of point metadata attributes

[keller-mark]

This PR clarifies how to access the attributes listed here when accessing the points data from the on-disk format.

Is this correct that the coordinate transformations are in "transform" in-memory but "coordinateTransformations" on-disk?

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 92.14%. Comparing base (7604a3d) to head (0c9c95c). :warning: Report is 7 commits behind head on main.

Additional details and impacted files

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##             main     #957   +/-   ##
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  Coverage   92.14%   92.14%           
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  Files          48       48           
  Lines        7473     7473           
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  Hits         6886     6886           
  Misses        587      587           

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