regexp apidoc was misspelled

regexp.h

@@ -120,15 +120,16 @@ struct reg_code_blocks {
 
 
 /*
-= for apidoc AyT||regexp
-  The regexp/REGEXP struct, see L<perlreapi> for further documentation
-  on the individual fields. The struct is ordered so that the most
-  commonly used fields are placed at the start.
-
-  Any patch that adds items to this struct will need to include
-  changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
-  (C<pregfree()>). This involves freeing or cloning items in the
-  regexp's data array based on the data item's type.
+=for apidoc AyT||regexp
+The regexp/REGEXP struct, see L<perlreapi> for further documentation
+on the individual fields. The struct is ordered so that the most
+commonly used fields are placed at the start.
+
+Any patch that adds items to this struct will need to include
+changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
+(C<pregfree()>). This involves freeing or cloning items in the
+regexp's data array based on the data item's type.
+=cut
 */
 
 /* NOTE: There is a copy of this struct in the documentation in perlreapi.pod