chore: refine some comments and naming in kubebuilderx

[cjc7373]

Make it look better in rendered go doc html.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 60.07%. Comparing base (b5f15e0) to head (7e00b27).

Files with missing lines	Patch %	Lines
...oller/instanceset/reconciler_instance_alignment.go	0.00%	1 Missing ⚠️
...ntroller/instanceset/reconciler_revision_update.go	0.00%	1 Missing ⚠️
pkg/controller/instanceset/reconciler_update.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8991   +/-   ##
=======================================
  Coverage   60.06%   60.07%           
=======================================
  Files         390      390           
  Lines       46516    46518    +2     
=======================================
+ Hits        27942    27947    +5     
+ Misses      15886    15885    -1     
+ Partials     2688     2686    -2     

Flag	Coverage Δ
unittests	60.07% <66.66%> (+<0.01%)	⬆️

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