Expose and improve the docstrings of export_od and import_id

[erlend-aasland]

Resolves #472

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.68%. Comparing base (503918c) to head (4dcdb38).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #473   +/-   ##
=======================================
  Coverage   67.68%   67.68%           
=======================================
  Files          26       26           
  Lines        3104     3104           
  Branches      521      521           
=======================================
  Hits         2101     2101           
  Misses        862      862           
  Partials      141      141           

Files	Coverage Δ
canopen/objectdictionary/__init__.py	82.29% <100.00%> (ø)

[erlend-aasland]

Docstring changes:

• Consistent punctuation and capitalisation.
• Mark up literals using monospaced font.
• Remove unneeded return type annotation.
• Use typing to autogenerate param list and return info.

[erlend-aasland]

Thanks for the review and your insights.