expand open_service_nursery() example

[belm0]

No description provided.

[codecov]

Codecov Report

Merging #12 (7091c8a) into master (57ec551) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   99.36%   99.27%   -0.10%     
==========================================
  Files          13       13              
  Lines        1101     1101              
  Branches       77       77              
==========================================
- Hits         1094     1093       -1     
  Misses          5        5              
- Partials        2        3       +1     

Impacted Files	Coverage Δ
tricycle/_service_nursery.py	100.00% <ø> (ø)
tricycle/_tests/test_streams.py	99.50% <0.00%> (-0.50%)	⬇️

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