[datastream-to-spanner] Update description of shardingContextFilePath in README

[aasthabharill]

b/444345622

[gemini-code-assist]

Summary of Changes

Hello @aasthabharill, 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 improving the clarity of the shardingContextFilePath parameter's documentation within the DataStreamToSpanner template. By providing a more precise description of the expected JSON format, this change aims to help users correctly configure the sharding context, thereby reducing potential setup issues and enhancing the overall user experience.

Highlights

• Documentation Clarity: The description for the shardingContextFilePath parameter has been updated to explicitly state that it expects a JSON file, and clarifies the top-level key StreamToDbAndShardMap within that JSON.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.02%. Comparing base (58d2477) to head (632379f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3090      +/-   ##
============================================
+ Coverage     50.41%   54.02%   +3.61%     
+ Complexity     5023     2137    -2886     
============================================
  Files           970      485     -485     
  Lines         59609    28039   -31570     
  Branches       6507     2942    -3565     
============================================
- Hits          30051    15149   -14902     
+ Misses        27436    11958   -15478     
+ Partials       2122      932    -1190     

Components	Coverage Δ
spanner-templates	71.62% <ø> (+0.97%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	80.03% <ø> (ø)
spanner-live-reverse-replication	77.46% <ø> (ø)
spanner-bulk-migration	88.25% <ø> (ø)

Files with missing lines	Coverage Δ
...oud/teleport/v2/templates/DataStreamToSpanner.java	19.59% <ø> (ø)

... and 501 files with indirect coverage changes

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