refactor(core): add jsdocs for utility functions

[bdbch]

Changes Overview

I added a few more JSDocs for Tiptap utilitify functions on core.

Implementation Approach

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Testing Done

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Verification Steps

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Additional Notes

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Checklist

• I have renamed my PR according to the naming conventions. (e.g. feat: Implement new feature or chore(deps): Update dependencies)
• My changes do not break the library.
• I have added tests where applicable.
• I have followed the project guidelines.
• I have fixed any lint issues.

Related Issues

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