Merge branch 'ma/asciidoctor-fixes'

Build fix around use of asciidoctor instead of asciidoc

* ma/asciidoctor-fixes:
asciidoctor-extensions: fix spurious space after linkgit
Documentation/Makefile: add missing dependency on asciidoctor-extensions
Documentation/Makefile: add missing xsl dependencies for manpages

diff --cc Documentation/Makefile
Simple merge