Update `inlineCollections` list in ElementDocumentProcessor

[RachamimYaakobov]

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Description:

Added "Bold", "Italic", "Underline" types to the inlineCollections list

Checklist:

• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] 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
• [ ] I have tested my changes by running the extension in VS2017
• [x] I have tested my changes by running the extension in VS2019
• [x] I have tested my changes by running the extension in VS2022
• [x] If changes to the documentation are needed, I have noted this in the description above

[NicoVermeir]

@RachamimYaakobov so sorry for letting this go stale. Can you tell me which problem you're solving with your PR? Thank you for contributing!