inspector: add tips for Session

PR-URL: #47195
Reviewed-By: Kohei Ueno <kohei.ueno119@gmail.com>

Author: theanarkh

doc/api/inspector.md

@@ -27,6 +27,10 @@ changes:
 
 Deactivate the inspector. Blocks until there are no active connections.
 
+When using `Session`, the object outputed by the console API will not be
+released, unless we performed manually `Runtime.DiscardConsoleEntries`
+command.
+
 ## `inspector.console`
 
 * {Object} An object to send messages to the remote inspector console.
@@ -106,6 +110,10 @@ Create a new instance of the `inspector.Session` class. The inspector session
 needs to be connected through [`session.connect()`][] before the messages
 can be dispatched to the inspector backend.
 
+When using `Session`, the object outputed by the console API will not be
+released, unless we performed manually `Runtime.DiscardConsoleEntries`
+command.
+
 ### Event: `'inspectorNotification'`
 
 <!-- YAML