Change some =head1 to apidoc_section lines

apidoc_section is slightly favored over head1, as it is known only to
autodoc, and can't be confused with real pod.

1 files changed, 1 insertions, 1 deletions

diff --git a/regexp.h b/regexp.h
index e12c6a9ffa..16fddced28 100644
--- a/regexp.h
+++ b/regexp.h
@@ -252,7 +252,7 @@ typedef struct regexp_engine {
 #define RXapif_REGNAMES_COUNT  0x1000
 
 /*
-=head1 REGEXP Functions
+=for apidoc_section REGEXP Functions
 
 =for apidoc Am|REGEXP *|SvRX|SV *sv