Update docs to using dot product instead of implicit multiplication - Attempts to use Latex \bullet operator. - Mainly doing this because RTD ran out of space to build the latest   docs and a new commit is needed to attempt to build the docs again.
Update docs to using dot product instead of implicit multiplication
- Attempts to use Latex \bullet operator.
- Mainly doing this because RTD ran out of space to build the latest
  docs and a new commit is needed to attempt to build the docs again.

nsh87/regressors