ci: Manual fixes in documentation, fixing links. Add some closing )

[banasa44]

Description

Fixed some links that will generate a broken links error in Developer-Portal because of the update of Docusaurus from v2 to v3.
Removed some extra / that were generating this error.

Deleted an outdated markdown link (was pointing to a paragraph of another page that no longer exists).

Added some closing parenthesis ) that I spotted while fixing links (haven't reviewed documentation, just fixed spotted ones).

Task ID: OS-1070

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran all tests with success and extended them if necessary.
• I have updated the CHANGELOG.md file in the root folder.
• I have updated the DEPLOYMENT_CHECKLIST file in the root folder.
• I have updated the UPDATE_CHECKLIST file in the root folder.