Mutual TLS Sample (OAI#2625)

* Mutual TLS Sample

* Update versions/3.1.0.md

Co-authored-by: Darrel <[email protected]>

* Update versions/3.1.0.md

Co-authored-by: Darrel <[email protected]>

Co-authored-by: Darrel <[email protected]>

Author: 2 people

versions/3.1.0.md

@@ -3253,6 +3253,20 @@ scheme: bearer
 bearerFormat: JWT
 ```
 
+###### MutualTLS Sample
+
+```json
+{
+  "type": "mutualTLS",
+  "description": "Cert must be signed by example.com CA"
+}
+```
+
+```yaml
+type: mutualTLS
+description: Cert must be signed by example.com CA
+```
+
 ###### Implicit OAuth2 Sample
 
 ```json