[Schema] Update required/optional to just field

Signed-off-by: Rob Dolin <[email protected]>

Author: RobDolinMS

versions/3.0.md

@@ -175,7 +175,7 @@ Relative references used in $ref are processed as per [JSON Reference](https://t
 
 ### Schema
 
-In the following description, if a field, a property, or an object is not explicitly **Required** or described with a MUST or SHALL, it can be considered OPTIONAL. 
+In the following description, if a field is not explicitly **Required** or described with a MUST or SHALL, it can be considered OPTIONAL. 
 
 #### <a name="oasObject"></a>OpenAPI Object