Apply suggestions from code review

Co-authored-by: Daniël van Noord <[email protected]>

Author: Pierre-Sassoulas

doc/data/messages/r/raise-missing-from/related.rst

@@ -1 +1 @@
-- `PEP 3132 <https://www.python.org/dev/peps/pep-3132/>`_
+- `PEP 3132 <https://peps.python.org/pep-3132/>`_

pylint/checkers/exceptions.py

@@ -133,7 +133,11 @@ def _is_raising(body: list) -> bool:
     "W0707": (
         "Consider explicitly re-raising using 'raise NewError(...) from old_error'",
         "raise-missing-from",
-        "Python 3's exception chaining means it shows the traceback of the "
+        "Python's exception chaining shows the traceback of the "
+        "current exception, but also of the original exception. When you raise a "
+        "new exception after another exception was caught it's likely that the "
+        "second exception is a friendly re-wrapping of the first exception. In such "
+        "cases `raise from` provides a better link between the two tracebacks in the final error."
         "current exception, but also the original exception. Not using `raise "
         "from` makes the traceback inaccurate, because the message implies "
         "there is a bug in the exception-handling code itself, which is a "