MDEV-32535 Update signal hander user info more compassion and correct url

Blaming hardware and poor libraries seems on the rare end of the
scale of things that go wrong. Accept the blame, apologize, and
kindly request a bug report.

Also url change on stack traces is changed to include mariadbd.

Thanks Vlad for also raising that blaming was wrong.

sql/signal_handler.cc

@@ -170,11 +170,8 @@ extern "C" sig_handler handle_fatal_signal(int sig)
   my_safe_printf_stderr("[ERROR] mysqld got " SIGNAL_FMT " ;\n",sig);
 
   my_safe_printf_stderr("%s",
-    "This could be because you hit a bug. It is also possible that this binary\n"
-    "or one of the libraries it was linked against is corrupt, improperly built,\n"
-    "or misconfigured. This error can also be caused by malfunctioning hardware.\n\n");
-
-  my_safe_printf_stderr("%s",
+                        "Sorry, we probably made a mistake, and this is a bug.\n\n"
+                        "Your assistance in bug reporting will enable us to fix this for the next release.\n"
                         "To report this bug, see https://mariadb.com/kb/en/reporting-bugs\n\n");
 
   my_safe_printf_stderr("%s",
@@ -306,7 +303,7 @@ extern "C" sig_handler handle_fatal_signal(int sig)
   }
   my_safe_printf_stderr("%s",
     "The manual page at "
-    "https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mysqld/ contains\n"
+    "https://mariadb.com/kb/en/how-to-produce-a-full-stack-trace-for-mariadbd/ contains\n"
     "information that should help you find out what is causing the crash.\n");
 
 #endif /* HAVE_STACKTRACE */