Fix yaml reference rendering for object-type examples

[briandealwis]

Fixes: #5841

Description
Our JS rendering of the skaffold.yaml schemas was swallowing the key-part when walking the key-value pairs in an object-style example. The only examples of this type are the buildArgs fields of our builders.

Before

After

[container-tools-bot]

Please visit http://34.102.7.152:1313 to view changes to the docs.

[container-tools-bot]

Error creating deployment, please see controller logs for details.

[container-tools-bot]

Error creating deployment, please see controller logs for details.

[container-tools-bot]

Error creating deployment, please see controller logs for details.

[codecov]

Codecov Report

Merging #5872 (4322d29) into master (6c57b21) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5872   +/-   ##
=======================================
  Coverage   70.89%   70.89%           
=======================================
  Files         446      446           
  Lines       16855    16855           
=======================================
+ Hits        11949    11950    +1     
  Misses       4021     4021           
+ Partials      885      884    -1     

Impacted Files	Coverage Δ
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
pkg/skaffold/docker/parse.go	87.14% <0.00%> (+0.95%)	⬆️
pkg/skaffold/docker/image.go	79.72% <0.00%> (+1.38%)	⬆️

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[container-tools-bot]

Please visit http://34.102.7.152:1313 to view changes to the docs.

[MarlonGamez]

nice! Lgtm 👍🏼