Fix minor grammar issues in readingTherapy.html and made consistent s…

[smohyud4]

Describe your changes

In the Bibliotherapy header tag, I removed a comma after "Bibliotherapy partially overlaps with", and instilled a border-radius of 15px to make it consistent with the border-radius with the benefits section. I also changed the wording of the heading subtitle. These are mostly from Grammarly suggestions.

Screenshots - If Any (Optional)

Link to issue

No issue. I did not believe these changes "address core functionality or would require breaking changes", as per the contribution guide.

Checklist before requesting a review

• [x] I have performed a self-review of my code.
• [x] Followed the repository's Contributing Guidelines.
• [x] I ran the app and tested it locally to verify that it works as expected.
• [x] I have checked my code with an automatic accessibility tool and it shows no errors.

Additional Information (Optional)

Any additional information that you want to give us.

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