[WIP] Add heading for has-cardinality for #546

website/content/specification/syntax/constraints.md

@@ -42,7 +42,7 @@ The following constraint types are allowed for `<define-assembly>` definitions.
 - `<expect>`
 - [`<index>`](#index-constraints)
 - `<is-unique>`
-- `<has-cardinality>`
+- [`<has-cardinality>`](#has-cardinality-constraints)
 
 ## Common Constraint Data
 
@@ -203,6 +203,8 @@ The `@name` flag of an `<index>` constraint MUST specify the name of a previousl
 
 The `index-has-key` constraint has the same flags and assemblies as a [`index`](#index-constraints) constraint.
 
+### `has-cardinality` constraints
+
 ## Enumerated values
 
 The `allowed-values` constraint is a type of Metaschema constraint that restricts field or flag value(s) based on an enumerated set of permitted values.