Replace issue id by issue number in the doc

[BenFradet]

No description provided.

[BenFradet]

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

No fast optimizing though

[codecov-io]

Codecov Report

Merging #114 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   87.79%   87.79%           
=======================================
  Files          36       36           
  Lines         516      516           
  Branches        3        3           
=======================================
  Hits          453      453           
  Misses         63       63

Impacted Files	Coverage Δ
...4s/shared/src/main/scala/github4s/api/Issues.scala	70% <ø> (ø)	⬆️

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[juanpedromoreno]

LGTM!