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Personally I am always thrilled to get grammar/typo fix pull requests to my projects. It means someone cared enough about the project to go through the effort of making a PR just to alleviate a small aesthetic problem!

I think it's a nice gesture as long as you are polite about it. I would be happy that someone read the content and wanted to help improve it.

Definitely a good habit, I think more than the 50% of Github users are not English as mother tongues, so it's good to polish documentations, or like in this case, long texts. I always accept pull-requests for grammar improvements.

Since I can't code for shit, I submit pull requests to fix grammar and spelling a lot.

The reactions are overwhelmingly positive. Just make sure to leave a nice comment.