docs(spanner): update isolation level terminology in comments

[prathmeshcc]

Change transaction_test (spanner) naming terminology.

[gemini-code-assist]

Summary of Changes

Hello @prathmeshcc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the clarity and consistency of documentation and test comments within the Spanner client library. The changes involve updating specific terms related to transaction isolation levels and option handling, ensuring that the language used is more precise and aligns better with standard database terminology. This improves the overall readability and maintainability of the codebase for developers.

Highlights

• Documentation Clarity: Updated terminology in google/cloud/spanner/transaction.h comments to replace 'snapshot transactions' with 'repeatable read transactions' for improved accuracy regarding the kRepeatableRead isolation level.
• Test Comment Consistency: Revised comments in google/cloud/spanner/transaction_test.cc to use 'default options' instead of 'client default' and 'transaction options or default options' instead of 'transaction level or client level', enhancing consistency.

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[gemini-code-assist]

Code Review

This pull request focuses on improving the clarity of comments related to transaction isolation levels. The changes in transaction.h and transaction_test.cc replace more generic or ambiguous terms with specific and accurate terminology, such as changing 'snapshot transactions' to 'repeatable read transactions'. These updates enhance code readability and maintainability. The changes are correct and beneficial, and I have no further suggestions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.96%. Comparing base (253b689) to head (7aeea97).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15900      +/-   ##
==========================================
- Coverage   92.97%   92.96%   -0.01%     
==========================================
  Files        2460     2460              
  Lines      228864   228864              
==========================================
- Hits       212775   212753      -22     
- Misses      16089    16111      +22     

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