docs(samples): Update region tag for create table external hive partitioning

[steffnay]

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

[snippet-bot]

Here is the summary of changes.

You added 1 region tag.

• samples/snippets/src/main/java/com/example/bigquery/CreateTableExternalHivePartitioned.java:19, tag bigquery_create_table_external_hivepartitioned

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[codecov]

Codecov Report

Merging #1079 (a252e47) into master (3560cf0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1079   +/-   ##
=========================================
  Coverage     80.18%   80.18%           
  Complexity     1268     1268           
=========================================
  Files            79       79           
  Lines          6576     6576           
  Branches        761      761           
=========================================
  Hits           5273     5273           
  Misses          910      910           
  Partials        393      393           

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