sample: update region tag

[stephaniewang526]

correct region tag for sample https://devrel.corp.google.com/samples/211?product_id=217&priority=P1

[codecov]

Codecov Report

Merging #148 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #148      +/-   ##
============================================
- Coverage     77.44%   77.32%   -0.13%     
+ Complexity     1110     1109       -1     
============================================
  Files            73       73              
  Lines          5932     5904      -28     
  Branches        645      621      -24     
============================================
- Hits           4594     4565      -29     
+ Misses         1013     1010       -3     
- Partials        325      329       +4

Impacted Files	Coverage Δ	Complexity Δ
...com/google/cloud/bigquery/StandardSQLDataType.java	73.68% <0%> (-1.32%)	7% <0%> (ø)
...m/google/cloud/bigquery/StandardSQLStructType.java	84.61% <0%> (-1.1%)	5% <0%> (ø)
...ogle/cloud/bigquery/WriteChannelConfiguration.java	85.43% <0%> (-0.69%)	44% <0%> (ø)
...ava/com/google/cloud/bigquery/RoutineArgument.java	85.71% <0%> (-0.65%)	5% <0%> (ø)
...om/google/cloud/bigquery/LoadJobConfiguration.java	89.64% <0%> (-0.52%)	52% <0%> (ø)
...google/cloud/bigquery/ExternalTableDefinition.java	56.38% <0%> (-0.46%)	16% <0%> (ø)
...va/com/google/cloud/bigquery/StandardSQLField.java	90.47% <0%> (-0.44%)	7% <0%> (ø)
...java/com/google/cloud/bigquery/ViewDefinition.java	87.09% <0%> (-0.41%)	11% <0%> (ø)
...a/com/google/cloud/bigquery/InsertAllResponse.java	88.88% <0%> (-0.31%)	15% <0%> (ø)
...m/google/cloud/bigquery/QueryJobConfiguration.java	76.85% <0%> (-0.29%)	56% <0%> (ø)
... and 11 more

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