Fix wrong link on the custom-tests example, fixes #6591

[mururu]

Fixes: #6591

[aaron-prindle]

Thanks for the fix here! LGTM

[codecov]

Codecov Report

Merging #6592 (8cdff4c) into main (290280e) will decrease coverage by 0.08%.
The diff coverage is 54.42%.

@@            Coverage Diff             @@
##             main    #6592      +/-   ##
==========================================
- Coverage   70.48%   70.40%   -0.09%     
==========================================
  Files         515      517       +2     
  Lines       23150    23280     +130     
==========================================
+ Hits        16317    16390      +73     
- Misses       5776     5828      +52     
- Partials     1057     1062       +5     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/flags.go	90.81% <ø> (ø)
cmd/skaffold/skaffold.go	0.00% <ø> (ø)
pkg/skaffold/build/buildpacks/logger.go	0.00% <ø> (ø)
pkg/skaffold/config/options.go	100.00% <ø> (ø)
pkg/skaffold/debug/apply_transforms.go	22.64% <0.00%> (-0.44%)	⬇️
pkg/skaffold/debug/transform.go	95.91% <ø> (ø)
pkg/skaffold/docker/logger/log.go	22.64% <0.00%> (-0.44%)	⬇️
pkg/skaffold/kubectl/exec.go	100.00% <ø> (ø)
pkg/skaffold/schema/latest/v1/config.go	62.16% <ø> (ø)
pkg/skaffold/schema/v2beta21/upgrade.go	100.00% <ø> (ø)
... and 38 more

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