New PR template has some typos

1. The first line says `Thanks for making a pull request to MPCC.jl` but this repo is not MPCC.jl 2. One of the checklist items is `Lint workflow is passing` but `.github/workflows` does not contain a `Lint.yml` 3. It's a little confusing to ask about workflows passing when you submit the PR. It's much easier to let the workflows run and then see what happens (replicating the contents of a workflow .yml manually can be a certain amount of work).