Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  0539dc48cb2bb97ffcc157df1698e18be95b020b

Add first pass of guides

This is a first pass, so there could maybe be more details, and there could
almost certainly be more useful or structured information. But it explains
the gist of what we want, and that's a good start.

Change-Id: If1680b23ed3ffad56d889232a26a5faad05072d3