[main < docs-formating-fix-20230922] Update admonitions and link

[kgolubic]

Description

I've updated two admonitions related to Python version and fixed one broken link.

Pull request type

Please delete options that are not relevant.

• Documentation content changes

Related issues

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Reviewer checklist (the reviewer checks this part)

• Core feature implementation
• Tests
• Code documentation
• Documentation on gqlalchemy/docs

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