fixes #57795 adds require docs to cloud maps

doc/topics/cloud/map.rst

@@ -148,6 +148,26 @@ A map file may also be used with the various query options:
     and should not be used to destroy a subset of a map.
 
 
+Requiring Other Instances
+=========================
+
+The ``requires`` directive can be used in map files to ensure that one instance
+is created and available before another is created.
+
+.. code-block:: yaml
+
+    fedora_high:
+      - db1:
+          size: m5.xlarge
+      - web1:
+          size: m5.large
+          requires:
+            - db1
+
+This requisite is passed to the instance definition dicitonary in a map file
+and accepts a list of instance names as defined in the map.
+
+
 Setting up New Salt Masters
 ===========================