doc: improve inspector.close() description

PR-URL: nodejs#48494
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>

Author: mmarchini

doc/api/inspector.md

@@ -403,7 +403,8 @@ changes:
     description: The API is exposed in the worker threads.
 -->
 
-Deactivate the inspector. Blocks until there are no active connections.
+Attempts to close all remaining connections, blocking the event loop until all
+are closed. Once all connections are closed, deactivates the inspector.
 
 ### `inspector.console`