fix: update samples and docs to match rubric

[JustinBeckwith]

So... I made a few mistakes. During the code review of #368, a few things slipped:

1. Renames the sample files from bigquery_dataset_bleh.js to createDataset.js
2. Moves the region tags inside of the function definition, to match the rubric
3. Update cloud-repo-tools.json to include the new samples
4. Runs the repo-tools generation step to update the documentation

[codecov]

Codecov Report

Merging #374 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #374   +/-   ##
=======================================
  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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