add clarification btwn uid and uuid

[swyxio]

because of the naming it is easy to confuse like i was

[codecov-io]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master        #4   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           21        21           
=========================================
  Hits            21        21           

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[lukeed]

Thanks :D