Update oauth2-technical-profile.md

We worked with engineering and move these features from public preview to GA.
Team: Engg Harman Dhunna
PM: Pawan Nrisimha
Change has already been deployed into prod.
Last change required is to update this documentation.

Author: mistermik

articles/active-directory-b2c/oauth2-technical-profile.md

@@ -124,7 +124,7 @@ The following table lists the token endpoint metadata.
 | `HttpBinding` | No | The expected HTTP binding to the token endpoint. Possible values: `GET` or `POST`.  |
 | `AccessTokenResponseFormat` | No | The format of the access token endpoint call. For example, Facebook requires an HTTP GET method, but the access token response is in JSON format. Possible values: `Default`, `Json`, and `JsonP`. |
 | `ExtraParamsInAccessTokenEndpointResponse` | No | Contains the extra parameters that can be returned in the response from **AccessTokenEndpoint** by some identity providers. For example, the response from **AccessTokenEndpoint** contains an extra parameter such as `openid`, which is a mandatory parameter besides the access_token in a **ClaimsEndpoint** request query string. Multiple parameter names should be escaped and separated by the comma ',' delimiter. |
-|`token_endpoint_auth_method`| No| Specifies how Azure AD B2C sends the authentication header to the token endpoint. Possible values: `client_secret_post` (default), and `client_secret_basic` (public preview), `private_key_jwt` (public preview). For more information, see [OpenID Connect client authentication section](https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication). |
+|`token_endpoint_auth_method`| No| Specifies how Azure AD B2C sends the authentication header to the token endpoint. Possible values: `client_secret_post` (default), and `client_secret_basic`, `private_key_jwt`. For more information, see [OpenID Connect client authentication section](https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication). |
 |`token_signing_algorithm`| No | Specifies the signing algorithm to use when `token_endpoint_auth_method` is set to `private_key_jwt`. Possible values: `RS256` (default) or `RS512`.|
 
 ### Configure HTTP binding method