Clean up Spanner region tags.

[jmdobry]

Related

• Clean up Spanner region tags. GoogleCloudPlatform/ruby-docs-samples#244
• Add Spanner region tags. GoogleCloudPlatform/python-docs-samples#1376
• Clean up Spanner region tags. GoogleCloudPlatform/java-docs-samples#1045
• Clean up Spanner region tags. GoogleCloudPlatform/dotnet-docs-samples#454
• Clean up Spanner region tags. GoogleCloudPlatform/php-docs-samples#562
• Add Spanner region tags. GoogleCloudPlatform/golang-samples#403

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2857101). Click here to learn what that means.
The diff coverage is n/a.

@@ Coverage Diff @@## master #136 +/- ##
=======================================
Coverage ? 100% =======================================
Files ? 11 Lines ? 1257 Branches ? 0 =======================================
Hits ? 1257 Misses ? 0 Partials ? 0

Impacted Files	Coverage Δ
src/database.js	100% <ø> (ø)
src/instance.js	100% <ø> (ø)
src/table.js	100% <ø> (ø)

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