If documentation is available for a library, you have several options to access it...
via the Asset Drawer: To display the documentation of a library, click the corresponding icon.
via the Library Administration: Use the documentation icon to display the documentation of a library.
via the Service panel: The documentation icon will be displayed when you hover over a library in the Libraries folder. Use it to open the documentation of the corresponding library.
via the Manage Libraries dialog: Use the corresponding documentation icon to display the documentation of a library.
Regardless of which option you have used, the documentation of the corresponding library opens in a new browser tab.
This allows developers to access asset documentation at any time during the development process.