chore(docs): Update docs for useSDKCreds

[zachaller]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I have written unit and/or e2e tests for my change. PRs without these are unlike to be merged.
• Optional. I've added My organization is added to the USERS.md.
• I've signed the CLA and required builds are green.

[alexec]

You may want to update the other example too.

[codecov]

Codecov Report

Merging #2518 into master will increase coverage by 0.10%.
The diff coverage is 31.81%.

@@            Coverage Diff             @@
##           master    #2518      +/-   ##
==========================================
+ Coverage   11.21%   11.31%   +0.10%     
==========================================
  Files          75       75              
  Lines       31691    31705      +14     
==========================================
+ Hits         3555     3589      +34     
+ Misses      27658    27638      -20     
  Partials      478      478              

Impacted Files	Coverage Δ
pkg/apis/workflow/v1alpha1/workflow_types.go	11.45% <ø> (ø)
workflow/validate/validate.go	73.82% <25.00%> (-0.27%)	⬇️
workflow/controller/workflowpod.go	70.74% <100.00%> (+0.07%)	⬆️
workflow/controller/operator.go	60.94% <0.00%> (+0.20%)	⬆️
workflow/controller/dag.go	57.99% <0.00%> (+6.89%)	⬆️

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