perlapi: Clarify that a literal string must end in a NUL

Some entries already had this.  For those, it standardizes the text.

1 files changed, 4 insertions, 4 deletions

diff --git a/hv.h b/hv.h
index c249b8f8e2..e30f262f94 100644
--- a/hv.h
+++ b/hv.h
@@ -543,8 +543,8 @@ struct refcounted_he {
 /*
 =for apidoc m|SV *|refcounted_he_fetch_pvs|const struct refcounted_he *chain|const char *key|U32 flags
 
-Like L</refcounted_he_fetch_pvn>, but takes a literal string instead of
-a string/length pair, and no precomputed hash.
+Like L</refcounted_he_fetch_pvn>, but takes a C<NUL>-terminated literal string
+instead of a string/length pair, and no precomputed hash.
 
 =cut
 */
@@ -555,8 +555,8 @@ a string/length pair, and no precomputed hash.
 /*
 =for apidoc m|struct refcounted_he *|refcounted_he_new_pvs|struct refcounted_he *parent|const char *key|SV *value|U32 flags
 
-Like L</refcounted_he_new_pvn>, but takes a literal string instead of
-a string/length pair, and no precomputed hash.
+Like L</refcounted_he_new_pvn>, but takes a C<NUL>-terminated literal string
+instead of a string/length pair, and no precomputed hash.
 
 =cut
 */