Merge https://github.com/google/adk-python/pull/3975
### Link to Issue or Description of Change
Fixing various typos: see commit diffs for details
**1. Link to an existing issue (if applicable):**
- Closes: N/A
- Related: N/A
**2. Or, if no issue exists, describe the change:**
Fixing various typos: see commit diffs for details
**Problem:**
Improve quality of repo
**Solution:**
Pull this P/R
### Testing Plan
N/A
**Unit Tests:**
- [N/A] I have added or updated unit tests for my change.
- [X] All unit tests pass locally.
**Manual End-to-End (E2E) Tests:**
N/A
### 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.
- [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.
- [X] 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
N/A
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3975 from didier-durand:fix-typos-b ca1cba4e7afe99bb60efffb4de79a2bfe8522ea8
PiperOrigin-RevId: 868308215
Merge https://github.com/google/adk-python/pull/3944
### 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:** fixing various typos in multiple files: see commit diffs for details
**Problem:**
Discovered typos while reading ADK repo
**Solution:**
Submitted this PR to fix them
### Testing Plan
N/A: changes only in comments, .md and docstrings.
**Unit Tests:**
- [N/A ] I have added or updated unit tests for my change.
- [X] All unit tests pass locally.
_Please include a summary of passed `pytest` results._
**Manual End-to-End (E2E) Tests:**
N/A
### 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.
- [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.
- [X] 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
N/A
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3944 from didier-durand:fix-typos-a 02378a488d9a87ac9b6b7397fe9ad7c393faf16a
PiperOrigin-RevId: 868245940
Merge https://github.com/google/adk-python/pull/4221
### Link to Issue or Description of Change
N/A
**2. Or, if no issue exists, describe the change:**
Fixing various typos in .py files to improve quality: see commit diffs for details
**Problem:**
See above
**Solution:**
Fixing the typos
### Testing Plan
N/A
**Unit Tests:**
N/A
**Manual End-to-End (E2E) Tests:**
N/A
### 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.
- [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
N/A
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/4221 from didier-durand:fix-typos-e 1bcc8e05cdc116451222dd7fd7b0657745f769c1
PiperOrigin-RevId: 859332402
Merge https://github.com/google/adk-python/pull/4175
### Link to Issue or Description of Change
**1. Link to an existing issue (if applicable):**
N/A: just fixing typos discovered while reading the repo
**2. Or, if no issue exists, describe the change:**
No code change, just typo fixes: see commit diffs for all details
**Problem:**
Trying to improve overall repo quality
**Solution:**
Fixing typos as they get discovered
### Testing Plan
N/A
**Unit Tests:**
N/A
**Manual End-to-End (E2E) Tests:**
N/A
### 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.
- [ ] I have manually tested my changes end-to-end.
- [ ] Any dependent changes have been merged and published in downstream modules.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/4175 from didier-durand:fix-typos-c 16e93ed2d9bc153fa0332ab1ae39633fcc5056e9
PiperOrigin-RevId: 858751240
Didier DurandandCopybara-Service