refactor(samples): fix loadJSONFromGCSTruncate wrong function

[steffnay]

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[JustinBeckwith]

It looks like we introduced 404's in the docs with the previous samples change. Would you mind submitting a PR to address those first, so the CI goes green?

[codecov]

Codecov Report

Merging #386 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #386   +/-   ##
=======================================
  Coverage   99.44%   99.44%           
=======================================
  Files           4        4           
  Lines         544      544           
  Branches       75       75           
=======================================
  Hits          541      541           
  Misses          2        2           
  Partials        1        1

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