Installation guide txt file
Yes there is. It's called asciidoc.
AsciiDoc is a text document format for writing notes, documentation, articles, books, ebooks, slideshows, web pages, man pages and blogs. AsciiDoc files can be translated to many formats including HTML, PDF, EPUB, man page.
I have not verified whether your PhpStorm example is also AsciiDoc, but it is very likely.