Fix typos

[sadikkuzu]

This pull request addresses multiple minor documentation and code comment fixes to correct typos and improve clarity. These changes do not introduce functional modifications but enhance readability and professionalism.

Documentation Fixes:

• Corrected a typo in the "Security Considerations" section header in design/design.md. ("Securty" → "Security")
• Fixed spelling errors in the "Governance and Community" section of design/design.md. ("accomodating" → "accommodating")
• Updated the "Proposals" section in design/design.md to fix a typo. ("accomodate" → "accommodate")

Code Comment Fixes:

• Corrected a typo in a comment in mcp/logging.go. ("LoggingMesssage" → "LoggingMessage")
• Fixed a typo in a comment in mcp/streamable.go. ("priviledged" → "privileged")

Motivation and Context

This PR is for fixing some typos in the repo

How Has This Been Tested?

by code diff

Breaking Changes

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context