Allow <?php in documentation

[malkusch]

This is a very minor issue and also acceptable if it won't be fixed. I had to remove <?php from my documentation to get test-flight work.

[cundd]

I'm not sure if there is a common format for code in Markdown files. But ignoring <php at the beginning should not be that hard.

[cundd]

I'll have a look at it

[malkusch]

Thank you, but again: This is a very minor feature. It's not hard to remove that from the documentation itself.