docs(report): add remark about path to filter licenses using .trivyignore.yaml file

[DmitriyLewen]

Description

We currently doesn't support using path field in .trivyignore.yaml file to filter package licenses.
More information - #6117.

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).