Add documentation for sepCensored.R

There are two functions here, need documentation for both.

sepCensored
- [ ] title
- [ ] description
- [ ] parameter definitions
- [ ] description of what is returned
- [ ] examples of how to use the function

whichCensored
- [ ] title
- [ ] description
- [ ] parameter definitions
- [ ] description of what is returned
- [ ] examples of how to use the function