Replace all usages of "obviously", "just", and "simply" with explanations

[melinath]

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The docs are currently riddled with uses of "just", "obviously", "simply" and similar in spots that are not particularly obvious or simple to someone like myself who is trying to learn how to use uWSGI.

[unbit]

Hi @melinath feel free to make a pull request, none of the major docs contributors is a native english speaker, so some "strength" in wording could be totally wrong. (or more simply it is insensibility of the writer of turn [me included] that we should fix :P)