docs: fix typo

[osrm]

Change Overview

This change corrects typos in contributing.md and types.ts: "chanages" to "changes," "emmited" to "emitted," and "backrgound" to "background." These corrections improve clarity and professionalism in the documentation and code, ensuring a better user experience.

Impact of Change

• Bug fix
  • External Facing (resolves an issue customers are currently experiencing)
  • Security Impact (fixes a potential vulnerability)
• Feature
  • Visible Change (changes semver of API surface or other change that would impact user/dev experience)
  • High Usage (impacts a major part of the core workflow for users)
• Performance Improvement
• Refactoring
• Other: Refine text(typo fix)

Detailed Technical Description of Change

Fixed minor typos in the documentation.

Testing Approach and Results

No testing needed for typo fixes, but the documentation has been reviewed to ensure accuracy.

Collateral Work or Changes

No collateral work or changes required.

Operational Impact

No operational impact, as the changes are purely cosmetic.