embed.h: Clarify comment

Author: khwilliamson

embed.h

@@ -91,7 +91,7 @@
 #endif /* !defined(PERL_CORE) */
 #if defined(PERL_CORE) || !defined(PERL_NO_SHORT_NAMES)
 
-/* Hide global symbols */
+/* Create short name macros that hide any need for thread context */
 
 # define AvFILL_(a)                             Perl_AvFILL_(aTHX_ a)
 # define Gv_AMupdate(a,b)                       Perl_Gv_AMupdate(aTHX_ a,b)

regen/embed.pl

@@ -907,7 +907,7 @@ sub generate_embed_h {
 
     #if ! defined(PERL_NO_SHORT_NAMES) || defined(PERL_CORE)
 
-    /* Hide global symbols */
+    /* Create short name macros that hide any need for thread context */
 
     END