Ensure IOC macro default values displayed in the GUI are clearly understood

As an IBEX user I want my IOC macro setting to be intuitive so that I don't get confused about my defaults

**Acceptance Criteria**
1. The use of macro names and defaults is well described on the wiki
1. The LS460 matches those standards

**Notes**
1. The page above might already exist, in which case the LS460 needs to match it
1. The confusion came when connecting an LS460 that in the IOC setup had `PARITY` using a `{default}` value, `Use Default?` was True, and the default was listed as `odd`. In the `st-common.cmd` when setting parity this was listed as `$(PARITY=even)`. When the IOC was ran it used `even` parity, and errored. Hotfixing that line in the `st-common.cmd` meant that odd was picked up.
1. It needs to be clear in the wiki that this should match the `cmd` defaults, or if it is possible/desirable to have the default in the XML be different, then the default being used needs to be picked up correctly - as in the value listed in the XML.
1. This is also something to be aware of when reviewing