Update Conn.Close docs

[nhooyr]

Closes #103

[codecov]

Codecov Report

Merging #105 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #105   +/-   ##
=======================================
  Coverage   75.21%   75.21%           
=======================================
  Files          14       14           
  Lines        1045     1045           
=======================================
  Hits          786      786           
- Misses        202      203    +1     
+ Partials       57       56    -1

Impacted Files	Coverage Δ
statuscode.go	100% <ø> (ø)	⬆️
websocket.go	70.27% <100%> (ø)	⬆️

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