Use =back to finish =over (found using pod2latex).

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PR:

doc/crypto/ASN1_generate_nconf.pod

@@ -109,7 +109,7 @@ should be a section name which will contain the contents. The
 field names are ignored and the values are in the generated
 string format. If B<value> is absent the the content will be empty.
 
-=cut
+=back
 
 =head2 MODIFIERS
 
@@ -151,7 +151,7 @@ then the value string must be a valid B<UTF8> string. For B<HEX> the output must
 be a set of hex digits. B<BITLIST> (which is only valid for a BIT STRING) is a
 comma separated list of set bits.
 
-=cut
+=back
 
 =head1 EXAMPLES