Improve documentation for Help Text

[dregad]

I find the page at http://getopt-php.github.io/getopt-php/help.html a bit confusing, it's not really clear just reading that and without looking at the code, to understand what has to be done, and how one is supposed to customize things.

[tflori]

Without looking at the code it will be hard to understand how to customize the help text. I will have to think more about it..

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[tflori]

@dregad I had a look into the current help and had the same impression 😄

https://github.com/getopt-php/getopt-php/blob/4283ba7302bd069c9eb48c6b7a8fe859d980d488/docs/help.md

It was describing the the three templates before the customization. I changed this and the texts. How else we could improve this documentation?

[dregad]

Thanks for the quick response, I made some suggestions for improvement in #90, and see also #91.