Fix typo (review feedback)

Co-authored-by: Ralf Handl <[email protected]>

Author: handrews

versions/3.0.4.md

@@ -2718,7 +2718,7 @@ Field Name | Type | Description
 <a name="propertyName"></a>propertyName | `string` | **REQUIRED**. The name of the property in the payload that will hold the discriminator value.
 <a name="discriminatorMapping"></a> mapping | Map[`string`, `string`] | An object to hold mappings between payload values and schema names or references.
 
-The discriminator object is legal only when using one of the composite keywords `oneOf`, `anyOf`, `allOf`.  Note that because the discrinating property's value is used as a component name and/or as the key in the `mapping` object, the behavior of any value that is not a string is undefined.
+The discriminator object is legal only when using one of the composite keywords `oneOf`, `anyOf`, `allOf`.  Note that because the discriminating property's value is used as a component name and/or as the key in the `mapping` object, the behavior of any value that is not a string is undefined.
 
 In OAS 3.0, a response payload MAY be described to be exactly one of any number of types: