local lucee docs doesn't use member-position for object methods

pointed this out on slack last night and I updated docs https://github.com/lucee/lucee-docs/pull/848

I had just copied the logic from the local docs, which just drops the first argument, rather than checking the member position value and applying it
https://github.com/lucee/Lucee/blob/5.3/core/src/main/cfml/context/doc/objects.cfm#L149

http://127.0.0.1:8888/lucee/doc/objects.cfm?item=datetime.diff

https://docs.lucee.org/reference/objects/datetime/diff.html