doc(storage): show how to configure endpoints

[coryan]

Fixes #8353

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[google-cloud-cpp-bot]

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[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• google/cloud/storage/examples/storage_client_initialization_samples.cc:67, tag storage_set_client_endpoint

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[codecov]

Codecov Report

Merging #8354 (124fcf9) into main (45a60a6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #8354   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files        1355     1355           
  Lines      120964   120977   +13     
=======================================
+ Hits       114910   114926   +16     
+ Misses       6054     6051    -3     

Impacted Files	Coverage Δ
google/cloud/storage/client.h	99.79% <ø> (ø)
.../examples/storage_client_initialization_samples.cc	100.00% <100.00%> (ø)
google/cloud/bigtable/internal/common_client.cc	95.71% <0.00%> (-1.43%)	⬇️
...integration_tests/schema_admin_integration_test.cc	98.88% <0.00%> (-1.12%)	⬇️
google/cloud/pubsub/samples/samples.cc	92.10% <0.00%> (-0.24%)	⬇️
...cloud/pubsub/internal/subscription_session_test.cc	98.25% <0.00%> (+0.49%)	⬆️
.../cloud/storage/benchmarks/throughput_experiment.cc	74.87% <0.00%> (+0.50%)	⬆️
...ud/spanner/integration_tests/client_stress_test.cc	86.18% <0.00%> (+0.65%)	⬆️
...le/cloud/storage/internal/curl_download_request.cc	90.10% <0.00%> (+1.41%)	⬆️

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[coryan]

/cc @Breathtender

[google-cloud-cpp-bot]

Google Cloud Build Logs
For commit: 124fcf94af4abb37acdb3116481862d9f2b197c0

• Public Access Build Logs
• Cloud Build Console (requires auth)
• Kokoro Logs (requires auth)

ℹ️ NOTE: Kokoro logs are linked from "Details" below.