Docs & improvements for License reviews, TO-DOs, updated UI & License policies

[OmkarPh]

Description

Document several UI section updates in License Explorer made in #610

License policies are shown in the License info dashboard and Tableview.
It can be enhanced more.
Also, there is a need to add proper documentation for policies

[OmkarPh]

Note- There's already an outdated section (currently hidden) for this
https://github.com/nexB/scancode-workbench/tree/e7914f47bba05db1d623244ba2f2347411594ebb/docs/source/how-to-guides/special-topics