This summary is not the rule. The rule text controls.
Here's a plain English summary:
This rule explains how the earlier rules apply when a case is in municipal court instead of a higher court. The main point is about how papers get delivered to people involved in the case.
If your case is in municipal court, the same basic rules apply as they would in other courts. The difference is who delivers the paperwork. Instead of using a general process server, the delivery has to be done by a police officer from that city or by the sheriff from the county where the person lives or can be found.
In short, this rule makes sure that official documents in municipal court cases get delivered by proper law enforcement, either the city's own police or the county sheriff, depending on where the person is located.