My terminology might not be correct. Bare with me.

My house was built in 1960. According to
an electrician I had that did some work for me , He said the wiring was
grounded to the back of the metal boxes.

I have changed out many outlets but have never run into this situation
before

I decided to change out the double switches near my front door. One
switch is for the outside light and the other goes to an outlet on the
wall . Where you can plug
in a light and switch it on from from the wall switch and bottom part of
the outlet is just a regular plug.

Problem

When I took the switches out to replace with new. I found two grounding
wires twisted together not attached to the box.
There are 2 separate cables coming into the box. It was obvious which
grounding wire came from each cable , w/ blk, white and ground. I
untwisted the grounds and
attached the grounding wire to the green grounding screw for each
switch.

Did I do the right thng?

Thanks in advance for any help.

Pat