doc: fixing various typos

[didier-durand]

Link to Issue or Description of Change

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

N/A

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

Just fixing typos in comments / documentation

Problem:
Improve repo quality

Solution:
Fixing typos: see commit diffs for details

Testing Plan

N/A

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

N/A

Manual End-to-End (E2E) Tests:

N/A

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• [N/A] 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] New and existing unit tests pass locally with my changes.
• [N/A] I have manually tested my changes end-to-end.
• [N/A ] Any dependent changes have been merged and published in downstream modules.

Additional context

[gemini-code-assist]

Summary of Changes

Hello @didier-durand, 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 enhances the overall quality and readability of the project's documentation and code comments by addressing various minor typographical errors and grammatical inconsistencies. The changes ensure clearer and more professional communication throughout the explanatory texts, contributing to a more polished codebase.

Highlights

• Documentation Clarity: Corrected 'bi-directional' to 'bidirectional' in AGENTS.md for improved consistency.
• Grammar Correction: Fixed the article usage from 'an Jira connection' to 'a Jira connection' in contributing/samples/application_integration_agent/README.md.
• Typo Fix: Corrected 'toole' to 'tools' in contributing/samples/bigquery_mcp/README.md.
• Spelling Correction: Fixed the spelling of 'furtuer' to 'further' in contributing/samples/context_offloading_with_artifact/README.md.
• Verb Conjugation: Corrected 'it demonstrate' to 'it demonstrates' in contributing/samples/mcp_stdio_notion_agent/README.md.
• Article Usage: Changed 'An final agent' to 'A final agent' in contributing/samples/multi_agent_seq_config/README.md.
• Verb Conjugation: Corrected 'It pass in' to 'It passes in' in contributing/samples/oauth_calendar_agent/README.md.
• Formatting Consistency: Standardized '3 year old child' to '3-year-old child' in contributing/samples/spanner_rag_agent/README.md.
• Comment Refinement: Adjusted 'backup file' to 'back up file' in a comment within src/google/adk/cli/built_in_agents/tools/write_files.py.
• Grammar and Hyphenation: Corrected 'it transfer' to 'it transfers' and hyphenated 'Long running' to 'Long-running' in src/google/adk/flows/llm_flows/base_llm_flow.py.
• Compound Word Correction: Corrected 'hand crafted' to 'handcrafted' in src/google/adk/tools/pubsub/__init__.py.
• Spelling Corrections: Fixed 'parititon' to 'partition' and 'sepecified' to 'specified' in src/google/adk/tools/spanner/settings.py.

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[gemini-code-assist]

Code Review

This pull request does a good job of fixing various typos throughout the project's documentation and code comments, which improves overall quality. I've made two suggestions: one to fix an additional typo that was missed, and another to revert a change where the original grammar was more appropriate. Overall, great work on cleaning things up!

[didier-durand]

Hi, applied Gemini additional review suggestions