fix: typos in contract and comments

Description

This PR fixes some minor typos in the contracts.

Task ID: No task

See the framework lifecycle in packages/contracts/docs/framework-lifecycle to decide what kind of change this pull request is.

[x] 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 not work as expected)

[x] I have selected the correct base branch.
[x] I have performed a self-review of my own code.
[x] I have commented my code, particularly in hard-to-understand areas.
[x] My changes generate no new warnings.
[x] Any dependent changes have been merged and published in downstream modules.
[x] I ran all tests with success and extended them if necessary.
[ ] I have updated the CHANGELOG.md file in the root folder.
[ ] I have updated the DEPLOYMENT_CHECKLIST file in the root folder.
[ ] I have updated the UPDATE_CHECKLIST file in the root folder.
[ ] I have updated the Subgraph and added a QA URL to the description of this PR.