There's no such thing as "just a typo."
In Drupal, clients and prospective users see the user interface and documentation first. When we give them demos or when they evaluate the Drupal project, they aren’t just evaluating the code. Grammar, punctuation, readability, and spelling all matter. They give the project credibility. It is just as important to maintain the same high standards with the front facing side of Drupal as we do with the code.
I have been working with Drupal for about three years, and contributing back to the project for a little less than two.
I have learned quite a bit, but, most importantly, I have come to the conclusion that there is no such thing as “just” a typo, “just” a grammar issue, or “just” a documentation patch; not all patches have to fix code to be important.