Minor typo in documentation

In your documentation, e.g. here or here you write


instead of


I don’t know whether this is by intention or erroneously, at least it seems to be consistent throughout the whole documentation.

Based on the English Oxford Dictionaries, the general rule is that you shouldn’t use an apostrophe for plurals unless it’s used with a single letter or single number (under Apostrophes and plural forms): https://en.oxforddictionaries.com/punctuation/apostrophe

I think this is such a small issue that it might go unchanged for a long time, unless it bothers someone enough to change it and send a pull request on Github. Feel free to add an issue to Github (make sure there isn’t already one there), and even fork, change, and send a pull request if you want. :wink: