Adapted the docs to the rename of the "virtual" form option to "inherit_data"
Merge branch 'issue5899' of github.com:bschussek/symfony-docs into bschussek-issue5899

Conflicts:
	cookbook/form/index.rst
	cookbook/map.rst.inc
[#2107] Adding redirect map for moved entry
[#2107] Fixing a few more references to the old "virtual" option and adding some versionadded details