docs/gotests: fixed broken link for garbage collector

[kevinawoo]

No description provided.

[codecov]

Codecov Report

Merging #409 (c30da9e) into master (c0c2f90) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
+ Coverage   65.05%   65.22%   +0.17%     
==========================================
  Files          19       19              
  Lines        1159     1159              
==========================================
+ Hits          754      756       +2     
+ Misses        301      299       -2     
  Partials      104      104              

Impacted Files	Coverage Δ
docker.go	65.58% <0.00%> (+0.38%)	⬆️

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[mdelapenya]

Thanks for the fix!!