Issue #12423: Fix os.abort() documentation

The Python signal handler for SIGABRT is not called on os.abort() (only if the
signal is raised manually or sent by another process). Patch by Kamil Kisiel.
diff --git a/Doc/ACKS.txt b/Doc/ACKS.txt
index 2aa0316..58896b0 100644
--- a/Doc/ACKS.txt
+++ b/Doc/ACKS.txt
@@ -103,6 +103,7 @@
    * Robert Kern
    * Jim Kerr
    * Jan Kim
+   * Kamil Kisiel
    * Greg Kochanski
    * Guido Kollerie
    * Peter A. Koren
@@ -139,7 +140,7 @@
    * Ross Moore
    * Sjoerd Mullender
    * Dale Nagata
-   * Michal Nowikowski 
+   * Michal Nowikowski
    * Ng Pheng Siong
    * Koray Oner
    * Tomas Oppelstrup
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index c2ea1be..c6e32f6 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -1666,8 +1666,9 @@
 
    Generate a :const:`SIGABRT` signal to the current process.  On Unix, the default
    behavior is to produce a core dump; on Windows, the process immediately returns
-   an exit code of ``3``.  Be aware that programs which use :func:`signal.signal`
-   to register a handler for :const:`SIGABRT` will behave differently.
+   an exit code of ``3``.  Be aware that calling this function will not call the
+   Python signal handler registered for :const:`SIGABRT` with
+   :func:`signal.signal`.
 
    Availability: Unix, Windows.