Generalize note for with-meta (guide, Step A)

The bullet point for `with-meta` describes how to implement it for Mal functions, but it's applicable to all Mal types, while the last sentence can be reordered to emphasize the details specific to metadata on functions.

process/guide.md

@@ -1661,11 +1661,11 @@ implementation.
   * `meta`: this takes a single mal function/list/vector/hash-map argument
     and returns the value of the metadata attribute.
   * `with-meta`: this function takes two arguments. The first argument
-    is a mal function/list/vector/hash-map and the second argument is
-    another mal value/type to set as metadata. A copy of the mal function is
-    returned that has its `meta` attribute set to the second argument.
-    Note that it is important that the environment and macro attribute
-    of mal function are retained when it is copied.
+    is a mal value and the second argument is another mal value/type
+    to set as metadata. A copy of the mal value is returned that has
+    its `meta` attribute set to the second argument.  Note that when
+    copying a mal function, it is important that the environment and
+    macro attribute are retained.
   * Add a reader-macro that expands the token "^" to
     return a new list that contains the symbol "with-meta" and the
     result of reading the next next form (2nd argument) (`read_form`) and the