Add documentation to ws_value_union_reinit()
Add missing memberof to documentation of ws_value_union_init_from_val()
Merge pull request #452 from neithernut/fix-value-union-documentation

Fix value union documentation
Fix cmd_func_set_pos

Actually, we're calling the command on an object. This object is the
shell_surface instance we want to alter here, not the first argument
passed to the command, right? So we should use this object to do our
transformation on, not something else.