Update 3.1.0.md (#2405)

Improve wording about 'summary' and 'description' in Reference Object

Author: greatvovan

versions/3.1.0.md

@@ -2241,8 +2241,8 @@ A simple object to allow referencing other components in the OpenAPI document, i
 Field Name | Type | Description
 ---|:---:|---
 <a name="referenceRef"></a>$ref | `string` | **REQUIRED**. The reference string.
-<a name="referenceSummary"></a>summary | `string` | A short summary which by default SHOULD override that of the referenced component. If the referenced object-type does not define a `summary` field, then this field has no effect.
-<a name="referenceDescription"></a>description | `string` | A description which by default SHOULD override that of the referenced component. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation. If the referenced object-type does not define a `description` field, then this field has no effect.
+<a name="referenceSummary"></a>summary | `string` | A short summary which by default SHOULD override that of the referenced component. If the referenced object-type does not allow a `summary` field, then this field has no effect.
+<a name="referenceDescription"></a>description | `string` | A description which by default SHOULD override that of the referenced component. [CommonMark syntax](https://spec.commonmark.org/) MAY be used for rich text representation. If the referenced object-type does not allow a `description` field, then this field has no effect.
 
 This object cannot be extended with additional properties and any properties added SHALL be ignored.