fixup! add paragraph about multiple threads

Author: pablogsal

peps/pep-0768.rst

@@ -110,7 +110,7 @@ expressions, and step through code dynamically. This approach would align
 Python's debugging capabilities with those of other major programming languages
 and debugging tools that support this mode.
 
-Specification
+/Specification
 =============
 
 
@@ -334,10 +334,10 @@ Multi-threading Considerations
 
 Debugging code injected through this interface executes opportunistically in
 whichever thread first encounters a safe evaluation point after the request is
-made. This behavior mirrors how Python handles signals, providing a reliable
-execution model without adding overhead. For developers needing to target
+made. This behavior is different on how Python handles signals in the sense that
+signal handlers can only run in the main thread. For developers needing to target
 specific threads, the debug script can be installed only on the desired thread
-structure or in all of them if needed.
+structure.
 
 The Global Interpreter Lock (GIL) continues to govern execution as normal when
 debug code runs. This means if a target thread is currently executing a C