Remove unnecessary emphasis around "process grid".
Reword description of ``dim_data``.
Remove redundant sentence in dim_data description.
Note that utils.py is included in the appendix.
Add periods for consistency.
Edit some formatting.
Improve empty dim alias description.
Tweak wording for undistributed dimensions desc.
Tweak formatting for Global Array Size description.
Two spaces after a sentence.
Word wrap to 79 chars.
Add quotes around 'dim_data' (usually).

I omit them in the body of the "Identical dim_data along an axis" section, as we actually use 'dim_data' to refer to a variable name instead of the distbuffer key.
Lowercase 'where' following code block

... describing the empty dimension dictionary alias.
Fix subtitle underline length.

Thanks, Travis!
Merge pull request #107 from enthought/feature/edit-protocol-rst

LGTM. Merging.