Fix typos in documentation

[ardaunal]

Correcting typo: placment -> placement Placment -> Placement

Description

Related Issue

Motivation and Context

How Has This Been Tested

Types of changes

• [ ] Bug fix (change which fixes an issue)
• [ ] New feature (change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My change requires a change to the documentation
• [x] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [x] All new and existing tests passed