Removed 'nickname' from list of optional claims

Confirmed that 'nickname' is not a valid optional claim - removing reference to 'nickname' in the docs.

Author: kjyam98

articles/active-directory/develop/active-directory-optional-claims.md

@@ -81,7 +81,6 @@ These claims are always included in v1.0 Azure AD tokens, but not included in v2
 | `pwd_exp`     | Password Expiration Time        | The datetime at which the password expires. |       |
 | `pwd_url`     | Change Password URL             | A URL that the user can visit to change their password.   |   |
 | `in_corp`     | Inside Corporate Network        | Signals if the client is logging in from the corporate network. If they're not, the claim isn't included.   |  Based off of the [trusted IPs](../authentication/howto-mfa-mfasettings.md#trusted-ips) settings in MFA.    |
-| `nickname`    | Nickname                        | An additional name for the user. The nickname is separate from first or last name. Requires the `profile` scope.|
 | `family_name` | Last Name                       | Provides the last name, surname, or family name of the user as defined in the user object. <br>"family_name":"Miller" | Supported in MSA and Azure AD. Requires the `profile` scope.   |
 | `given_name`  | First name                      | Provides the first or "given" name of the user, as set on the user object.<br>"given_name": "Frank"                   | Supported in MSA and Azure AD .  Requires the `profile` scope. |
 | `upn`         | User Principal Name | An identifer for the user that can be used with the username_hint parameter.  Not a durable identifier for the user and should not be used to key data. | See [additional properties](#additional-properties-of-optional-claims) below for configuration of the claim. Requires the `profile` scope.|