doc: remove boilerplate from landing page snippet

[coryan]

Before:

After:

Part of the work #10157

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This change is 

[codecov]

Codecov Report

Base: 93.97% // Head: 93.97% // No change to project coverage 👍

Coverage data is based on head (f18aa1a) compared to base (f18aa1a).
Patch has no changes to coverable lines.

❗ Current head f18aa1a differs from pull request most recent head a01158c. Consider uploading reports for the commit a01158c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10537   +/-   ##
=======================================
  Coverage   93.97%   93.97%           
=======================================
  Files        1630     1630           
  Lines      147027   147027           
=======================================
  Hits       138171   138171           
  Misses       8856     8856           

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[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• google/cloud/bigquery/quickstart/quickstart.cc:15, tag bigquerystorage_quickstart
• google/cloud/bigtable/quickstart/quickstart.cc:15, tag bigtable_quickstart
• google/cloud/iam/quickstart/quickstart.cc:15, tag iam_quickstart

You are about to delete 3 region tags.

• google/cloud/bigquery/quickstart/quickstart.cc:15, tag bigquerystorage_quickstart
• google/cloud/bigtable/quickstart/quickstart.cc:15, tag bigtable_quickstart
• google/cloud/iam/quickstart/quickstart.cc:15, tag iam_quickstart

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