Rollup merge of #146964 - Ayush1325:close-protocol, r=joboet

library: std: sys: pal: uefi: Add some comments

I seemed to have forgotten that since I am using GET_PROTOCOL attribute for the std usecases, I did not need to close the protocols explicitly. So adding these comments as a note to future self not to waste time on the same thing again.

Author: matthiaskrgr