remove incorrect doc para about exit from BEGIN

I misinterpreted the behaviour of exit from BEGIN when writing that
paragraph.  exit from BEGIN actually does cause perl_parse() to return
normally, but perl_run() wouldn't subsequently do anything.

diff --git a/perl.c b/perl.c
index 918854b..c7673fc 100644 (file)
--- a/perl.c
+++ b/perl.c
@@ -1644,13 +1644,6 @@ zero exit code can be augmented with a set bit that will be ignored.
 In any case, this function is not the correct place to acquire an exit
 code: one should get that from L</perl_destruct>.
 
-In most cases, if something happens during initialisation and parsing
-that causes the Perl interpreter to want to exit, this will cause this
-function to return normally with a non-zero return value.  Historically,
-a call to the Perl built-in function C<exit> from inside a C<BEGIN>
-block has been an exception, causing the process to actually exit.
-That behaviour may change in the future.
-
 =cut
 */