Fix #56, Remove 'return;' from last line of void functions.

[thnkslprpt]

Checklist

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
Fixes #56
Removes all cases of redundant "return;" statements on the last line of void functions.
Corrected a few typos in the comments that were noticed along the way.

Testing performed
None, prior to submission.

Expected behavior changes
No impact on behavior.

Contributor Info
@thnkslprpt