fix: correct parameter name typo and grammar across multiple files

[Ricardo-M-L]

Summary

• Rename misspelled parameter adressee → addressee in realtime_swarm.py (3 occurrences)
• Fix possessive: the it's value → its value in client.py
• Fix article usage: a OpenAI-compatible → an OpenAI-compatible in gemini.py (all other OAI client modules already use an)
• Fix article: a underlying → an underlying in graph_query_engine.py
• Fix article: a executor → an executor in tool_retriever.py

Test plan

• Verify no tests reference the old parameter name adressee
• Grammar/text changes only for the rest

🤖 Generated with Claude Code

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✅ Lancetnik
❌ yuj

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../agentchat/realtime/experimental/realtime_swarm.py	50.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
autogen/oai/client.py	54.47% <ø> (-6.35%)	⬇️
autogen/oai/gemini.py	19.92% <ø> (-49.92%)	⬇️
.../agentchat/realtime/experimental/realtime_swarm.py	29.11% <50.00%> (ø)

... and 37 files with indirect coverage changes

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