Transcribing them here:

Example circles

• Besties
• In-laws
• Trip mates

Example boundaries

• Memes & lols
• Summer '22 trip
• It takes a village

One way to think about it is circle names are simply about what the people in them have in common, whilst boundary names should probably be more about what kind of content you'll share and what permissions you'll grant over it to whom (note that a boundary can contain multiple circles and individual users, granting different permissions to each).

So extending your example, I could imagine having:

Circles

• Devs
• Bonfire devs
• Techies

Boundaries

• Tech stuff (granting see/read/interact permissions to those 3 circles)
• Coding resources (granting the same to the first 2 circles)
• Bonfire collab (granting additional permissions to Bonfire devs circle, like the ability to edit and delete)