Delete abortion joke

[Javiera Serrano Polo]

--- a/manual/startup.texi	2018-05-06 05:58:31.000000000 +0200
+++ b/manual/startup.texi	2018-05-06 06:02:43.000000000 +0200
@@ -1005,6 +1005,14 @@
 intercept this signal; see @ref{Signal Handling}.
 @end deftypefun
 
+@c Requested by rms.  Don't remove.
+@cartouche
+@strong{RMS Warning:} Proposed Federal censorship regulations
+may prohibit us from giving you information about the possibility of
+calling this function.  We would be required to say that this is not an
+acceptable way of terminating a program.
+@end cartouche
+
 @node Termination Internals
 @subsection Termination Internals
 
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