Changed typo in "definition" and "example of usage"

[ColinHDev]

Summary of the discussion

It's not a lot, but I noticed these two while reading over these classes for #1962 and didn't want to wait for a more meaningful PR later in fear of forgetting them.

Type of change (CHANGELOG.md)

Update

• Fixed a typo (double-space) in the definition of target description.
• Fixed a typo (ist instead of is) in the example of usage of study region.

Workflow checklist

Automation

Closes #

PR-Assignee

• [x] 🐙 Follow the Pull Request Workflow
• [ ] 📝 Update the CHANGELOG.md
• [ ] 📙 Add #'s to term tracker annotation

Reviewer

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• [ ] 🐙 Provided feedback and show sufficient appreciation for the work done