fix(help): Display value terminator and delimiter in help

[Aethelflaed]

Display value terminator and delimiter in the command usage and help.

I added explicitly [value delimiter: ':'] and [value terminator: ";"] to the help message.

Closes #5392 and #4812.

Related to #1052

[epage]

From our contributor docs

Issues work well discussing a need and how to solve it

• Focus: requirements gathering and design discussions
  Sometimes a branch or Draft PR might be used to demonstrate an idea

PRs work well for when the solution has already been discussed as an Issue or there is little to no discussion (obvious bug or documentation fixes)

• Focus: implementation discussions

In particular, solutions were being discussed in #4812 and that was a suggested starting point for #5392. I see that was included but then more was done. That should be discussed before we get to the PR.