v23/namespace: Add SetPermissions comment to reflect change in https://vanadium-review.googlesource.com/#/c/9877.
v23/namespace: Add SetPermissions comment to reflect change in
https://vanadium-review.googlesource.com/#/c/9877.

Change-Id: I2b6bb0faed8fb4fcf8019608ef439ef3bec2886e

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23