Update the limitations on project and group names/slugs
What does this MR do and why?
The documentation is updated to reflect the following:
- "+" is allowed in project name but not in group name.
- Parenthesis are allowed in group name but not in project name.
- Project and group slugs cannot contain parenthesis and "+".
- Project and group slugs cannot start or end with special characters.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #356162 (closed)