Merge https://github.com/google/adk-python/pull/3365
**Please ensure you have read the [contribution guide](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) before creating a pull request.**
fix typo for several files.
### Checklist
- [x] I have read the [CONTRIBUTING.md](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) document.
- [x] I have performed a self-review of my own code.
- [ ] I have commented my code, particularly in hard-to-understand areas.
- [ ] I have added tests that prove my fix is effective or that my feature works.
- [x] New and existing unit tests pass locally with my changes.
- [x] I have manually tested my changes end-to-end.
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### Additional context
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Co-authored-by: Liang Wu <wuliang@google.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3365 from UlookEE:fix_typo 1469de4ea354d1c205268b999183ee86c9d6a1d5
PiperOrigin-RevId: 827724001
Merge #3163
END_PUBLIC
Hello,
Since global_instruction has been deprecated, I’m migrating to GlobalInstructionPlugin.
During the migration, I encountered an error and am submitting this PR to fix it.
In [df05ed6](https://github.com/google/adk-python/commit/df05ed6b3b7b218d85fddc1acd6617802cdf6f2a) ,
GlobalInstructionPlugin references invocation_context, but CallbackContext actually contains _invocation_context.
This mismatch always causes an error during execution.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3180 from UlookEE:fix_global_instruction_plugin e289a12d69812f0abcfe77db0114fdb2045b31bc
PiperOrigin-RevId: 827682501
Haegyun LeeandCopybara-Service