Update login hint description

Author: shahbaz17

docs/sdk/pnp/android/custom-authentication.mdx

@@ -294,7 +294,7 @@ the following parameters.
 | `ui_locales?`                | The space separated list of language tags, ordered by preference. For instance `fr-CA fr en`.                                                                                                                                    |
 | `id_token_hint?`             | It denotes the previously issued ID token. It takes `String` as a value.                                                                                                                                                         |
 | `id_token?`                  | JWT (ID Token) to be passed for login.                                                                                                                                                                                           |
-| `login_hint?`                | It is used to send the user's email address during Email Passwordless login. It takes `String` as a value.                                                                                                                       |
+| `login_hint?`                | Used to specify the user's email address or phone number for Email/SMS Passwordless login flows. Takes a `String` value. For the SMS, the format should be: `+{country_code}-{phone_number}` (e.g. `+1-1234567890`)              |
 | `acr_values?`                | acc_values                                                                                                                                                                                                                       |
 | `scope?`                     | The default scope to be used on authentication requests. The defaultScope defined in the Auth0Client is included along with this scope. It takes `String` as a value.                                                            |
 | `audience?`                  | The audience, presented as the aud claim in the access token, defines the intended consumer of the token. It takes `String` as a value.                                                                                          |