Document issue: The SecurityBindingElement class does not contain a definition for CreateMutualCertificateBindingElement method.

### Type of issue

Other (describe below)

### Description

From this document: https://learn.microsoft.com/en-us/dotnet/api/system.servicemodel.channels.securitybindingelement?view=net-8.0


we can see the `SecurityBindingElement` class contain the `CreateMutualCertificateBindingElement` Method, but when we use it in the application, we can see the `SecurityBindingElement` class does not contain a definition for `CreateMutualCertificateBindingElement` method:


Therefore the documentation is wrong, please help to check and fix it.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.servicemodel.channels.securitybindingelement?view=net-8.0

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.ServiceModel.Channels/SecurityBindingElement.xml

### Document Version Independent Id

38a228cb-8716-12e5-dd4b-36fbf73f5154

### Article author

@dotnet-bot