correct spelling for "resources" as in current usage

Also makes the usage consistent with the other, already existing, uses in the file.

S22-package-format.pod

@@ -778,16 +778,16 @@ Several dynamic variables are available.
 This hash provides compile and runtime access to files associated with the
 L</Distribution> of the current compilation unit.
 
-So, if the C<META6.json> file contains this C<resource> section:
+So, if the C<META6.json> file contains this C<resources> section:
 
-  "resource" : [
+  "resources" : [
     "images/fido.png",
     "images/zowie.png",
     "libraries/inline_helper
   ]
 
 then the C<Distribution> is supposed to contain the files
-C<resource/images/fido.png> and C<resource/images/zowie.png>.  After
+C<resource/images/fido.png> and C<resources/images/zowie.png>.  After
 installation, IO objects of such a file would be available through
 
   %?RESOURCES<images><fido.png>