In my experience, one of the upsides of GitHub and similar services is that they drastically lower the process headache of merging patches.
When merging a patch means getting it out of the email and applying it to your branch, confirming it's valid / what changed, running your tests, then merging and pushing up the new version, it's quick to see why single-character or grammar/spelling fixes can be a burden.
With GitHub, I can see the PR, the diff, whether it'll merge cleanly, and whether my TravisCI tests pass right from the PR's page, and all I need to do is hit the Merge button. It makes me much more likely to review/merge PRs.
When merging a patch means getting it out of the email and applying it to your branch, confirming it's valid / what changed, running your tests, then merging and pushing up the new version, it's quick to see why single-character or grammar/spelling fixes can be a burden.
With GitHub, I can see the PR, the diff, whether it'll merge cleanly, and whether my TravisCI tests pass right from the PR's page, and all I need to do is hit the Merge button. It makes me much more likely to review/merge PRs.