Description

This adds documentation to all exported functions of all packages.

Before this change:

$ make golint
(...)
Found 861 lint suggestions; failing.
make: *** [golint] Error 1

Now:

$ make golint
(...)
Found 187 lint suggestions; failing.
make: *** [golint] Error 1

All remaining complaints by golint are about the naming of structs and fields that should be reviewed separately.

Type of change

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[x] This change requires a documentation update

[x] This contribution follows the project's code of conduct
[x] This contribution follows the project's contributing guidelines
[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[ ] ~I have added tests that prove my fix is effective or that my feature works~
[x] New and existing unit tests pass locally with my changes
[ ] ~Any dependent changes have been merged and published in downstream modules~