Fix up the Real Time WG Roles table

Why is this change being made?

Makes the table consistent, leaves an open line for future members.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what