doc: heck_dev_prefix

bash_profile.d/devenv.sh

@@ -2,6 +2,10 @@
 
 function heck_dev_env {
 
+  # get/set dev env prefix
+  # * PREFIX
+  # * DYLD_LIBRARY_PATH
+  # * PATH
   function heck_dev_prefix() {
     export PREFIX_OLD=${PREFIX}
     export PREFIX=${1}