docs: fix grammar and remove duplicate words in documentation and source

[88448844]

Fixed 'the the' typos and grammatical errors in README, docstrings, and sample agents.

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Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: N/A
• Related: N/A

2. Or, if no issue exists, describe the change:

Problem:
While exploring the repository, I noticed a few minor writing errors that impact professional readability:

1. Grammar: A subject-verb agreement error in README.md and llms.txt ("guide the agents works together").
2. Duplicate Words: Several instances of stuttering typos (repeating "the the" or "but the the") in docstrings within src/ and the contributing/samples/ directories.

Solution:
I have applied the following fixes to improve documentation quality:

• Corrected phrasing to "guide the agents to work together" in the README.
• Removed redundant instances of "the" in eval_metrics.py, spanner/settings.py, and the sample agent docstrings.
• No functional code or logic was altered.

Testing Plan

Unit Tests:

• All unit tests pass locally.

Summary:
Since this PR is strictly limited to documentation, comments, and docstrings, no new tests were required. I ran the standard test suite to ensure no syntax errors were accidentally introduced, and everything passed successfully.

Manual End-to-End (E2E) Tests:
N/A — This is a static documentation fix.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas. (N/A)
• I have added tests that prove my fix is effective or that my feature works. (N/A - Doc fix only)
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end. (N/A)
• Any dependent changes have been merged and published in downstream modules.

Additional context

None.

[gemini-code-assist]

Summary of Changes

Hello @88448844, 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 overall readability and professionalism of the project's documentation and docstrings. It addresses minor grammatical inaccuracies and removes repetitive words that were identified throughout the codebase, ensuring a cleaner and more precise textual presentation without altering any functional code or logic.

Highlights

• Grammar Correction: Corrected a subject-verb agreement error in the README.md and llms.txt files, changing 'guide the agents works together' to 'guide the agents to work together'.
• Duplicate Word Removal: Eliminated instances of redundant words, specifically 'the the' and 'but the the', from docstrings across various Python files including sample agents, eval_metrics.py, and spanner/settings.py.

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[gemini-code-assist]

Code Review

This pull request addresses several minor grammatical errors and typos across the repository's documentation, docstrings, and sample agents. The changes, such as correcting 'the the' to 'the' and fixing subject-verb agreement, are accurate and improve the overall readability and professionalism of the content. The scope of the PR is well-defined and the fixes have been applied correctly. No functional code has been altered, as stated in the description. The changes look good.