Update permissions.md for V8 Inspector access

Clarified that a target process does not need to run under `--permission` to open its V8 Inspector.

Author: cybe4sent1nel

doc/api/permissions.md

@@ -254,9 +254,9 @@ scope or any other Permission Model scope.
 
 A sandboxed process running under `--permission` with no additional
 grants can call `process._debugProcess(pid)` to force another Node.js
-process to open its V8 Inspector (if the process was initialized without `--permission`)
-regardless of whether that target
-process has any permission restrictions.
+process to open its V8 Inspector. The target process does not need to be
+running under `--permission` for this to work — any Node.js process
+running on the same host under the same OS user can be signaled.
 
 This is consistent with the Node.js threat model: Node.js trusts the
 OS environment in which it runs. Cross-process signaling is an