Since Swift was open-sourced, there have been many pull-requests on the project. Many of these have been grammatical or spelling fixes. Unfortunately, both on Twitter and on GitHub, there have been snide comments regarding these pull requests as being insubstantial.
Chris Lattner, the Swift project architect, thinks otherwise:
(You can find the specific tweet here).
For those of us who are already active in the open-source software community, it can be easy to forget this. It may be a good idea to take a look and see what your first pull-request was on Github. You can find out what that was on First Pull Request. Chances are good that for many people, their first pull-request was a typo fix in a README file, or fixing some formatting in a header file.
It's important to remember that all types of improvements to a project are important, even if they're just typo fixes. There's always a chance that the people making these "small" pull-requests on the newly open-sourced Swift project will make improvements in the future in more in-depth areas of the project as they continue to explore the code base.
On a final note, if you are looking to get involved in the open-source community but aren't sure where to start, take a look at Your First Pull Request. They post GitHub issues that would be appropriate for "first timers" to tackle.