docs: process code blocks similar to Markdown
docs: process code blocks similar to Markdown

Wrap pre-formatted example code in <code> elements. This works
similar to Markdown[1] code blocks[2]:

Every line indented with at least 2 spaces is considered a code
block and gets wrapped in <pre> and <code> tags.

Look at the documentation for e.g. virStreamSend for before-and-after
effects.

[1] http://daringfireball.net/projects/markdown/
[2] http://daringfireball.net/projects/markdown/syntax#precode

libvirt/libvirt,agx/libvirt,elmarco/libvirt,elmarco/libvirt,cbosdo/libvirt,nertpinx/libvirt,datto/libvirt,crobinso/libvirt,andreabolognani/libvirt,elmarco/libvirt,eskultety/libvirt,jardasgit/libvirt,jardasgit/libvirt,olafhering/libvirt,VenkatDatta/libvirt,olafhering/libvirt,zippy2/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,datto/libvirt,eskultety/libvirt,shugaoye/libvirt,zippy2/libvirt,cbosdo/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,shugaoye/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,rlaager/libvirt,olafhering/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,agx/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,datto/libvirt,andreabolognani/libvirt,jfehlig/libvirt,andreabolognani/libvirt,shugaoye/libvirt,taget/libvirt,eskultety/libvirt,rlaager/libvirt,agx/libvirt,cbosdo/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,eskultety/libvirt,datto/libvirt,agx/libvirt,agx/libvirt,rlaager/libvirt,shugaoye/libvirt,nertpinx/libvirt,shugaoye/libvirt,zippy2/libvirt,eskultety/libvirt,libvirt/libvirt,rlaager/libvirt,elmarco/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,datto/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,taget/libvirt,crobinso/libvirt,nertpinx/libvirt,zippy2/libvirt,taget/libvirt,nertpinx/libvirt,rlaager/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jfehlig/libvirt,taget/libvirt