Fix: Misc typo and broken link fixes

[andy-k-improving]

Description

Some typo / broken link fixes on documentation.

Related Issues

N/A

Check List

• [ ] New functionality includes testing.
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added.
  • [ ] New functionality has a user manual doc added.
• [ ] API changes companion pull request created.
• [x] Commits are signed per the DCO using --signoff.
• [ ] Public documentation issue/PR created.

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[andy-k-improving]

Hi @noCharger @dai-chen would you guys mind to have a look on this one. Your help would be appreciated!