I'm seeing an increasing number of 'tag info' wiki pages being edited to include installation instructions.
Originally these tag info pages contained a summary of the tag, describing what it relates to. A useful addition was the inclusion of links to source documentation, source files, downloads or other relevant information.
I don't agree with the inclusion of installation instructions as they are liable to change. See the pending change on https://stackoverflow.com/tags/mvcscaffolding/info for an example.