Add a doc example for combining action.group.include statements

[janbridley]

Description

Combining multiple conditions is useful in many instances, for example selecting multiple single state points within a workspace:

[[action.group.include]]
condition = ["/value", "==", 0.0]

[[action.group.include]]
all = [
    ["/other_value", "==", 1.0],
    ["/value", ">", 0.0]
]

Motivation and context

The toml array of tables concept was foreign to me, so I couldn't determine how to combine multiple conditions with a logical or. This doc snippet provides an example of how this can be achieved.

How has this been tested?

Validated that there is a change in number of matched statepoints when combining multiple all, multiple condition, and mixed all/condition statements.

Checklist:

• I have reviewed the Contributor Guidelines.
• I agree with the terms of the Row Contributor Agreement.
• My name is on the list of contributors (doc/src/contributors.md) in the pull request source branch.
• I have added a change log entry to doc/src/release-notes.md.