Update pep-0387.txt

Co-authored-by: Paul Moore <p.f.moore@gmail.com>

Author: vstinner

pep-0387.txt

@@ -127,7 +127,7 @@ the deprecated API.
 The documentation of a soft deprecation should explain why the API
 should be avoided, and if possible propose a replacement.
 
-Soft deprecation warnings are ignored by default. However, if the Python
+Soft deprecation warnings are not issued in a normal invocation of Python. However, if the Python
 development mode is enabled, or if Python is built in debug mode, these
 warnings are displayed. The ``SoftDeprecationWarning`` category (new in
 Python 3.13) can be used to filter these warnings.