Generate docs for TOTP

Author: prameshj

docs-devsite/auth.md

@@ -93,6 +93,8 @@ Firebase Authentication
 |  [PhoneMultiFactorGenerator](./auth.phonemultifactorgenerator.md#phonemultifactorgenerator_class) | Provider for generating a [PhoneMultiFactorAssertion](./auth.phonemultifactorassertion.md#phonemultifactorassertion_interface)<!-- -->. |
 |  [RecaptchaVerifier](./auth.recaptchaverifier.md#recaptchaverifier_class) | An [reCAPTCHA](https://www.google.com/recaptcha/)<!-- -->-based application verifier. |
 |  [SAMLAuthProvider](./auth.samlauthprovider.md#samlauthprovider_class) | An [AuthProvider](./auth.authprovider.md#authprovider_interface) for SAML. |
+|  [TotpMultiFactorGenerator](./auth.totpmultifactorgenerator.md#totpmultifactorgenerator_class) | Provider for generating a [TotpMultiFactorAssertion](./auth.totpmultifactorassertion.md#totpmultifactorassertion_interface)<!-- -->. |
+|  [TotpSecret](./auth.totpsecret.md#totpsecret_class) | Provider for generating a [TotpMultiFactorAssertion](./auth.totpmultifactorassertion.md#totpmultifactorassertion_interface)<!-- -->.<!-- -->Stores the shared secret key and other parameters to generate time-based OTPs. Implements methods to retrieve the shared secret key, generate a QRCode URL. |
 |  [TwitterAuthProvider](./auth.twitterauthprovider.md#twitterauthprovider_class) | Provider for generating an [OAuthCredential](./auth.oauthcredential.md#oauthcredential_class) for [ProviderId](./auth.md#providerid)<!-- -->.TWITTER. |
 
 ## Interfaces
@@ -130,6 +132,8 @@ Firebase Authentication
 |  [PopupRedirectResolver](./auth.popupredirectresolver.md#popupredirectresolver_interface) | A resolver used for handling DOM specific operations like [signInWithPopup()](./auth.md#signinwithpopup) or [signInWithRedirect()](./auth.md#signinwithredirect)<!-- -->. |
 |  [ReactNativeAsyncStorage](./auth.reactnativeasyncstorage.md#reactnativeasyncstorage_interface) | Interface for a supplied <code>AsyncStorage</code>. |
 |  [RecaptchaParameters](./auth.recaptchaparameters.md#recaptchaparameters_interface) | Interface representing reCAPTCHA parameters.<!-- -->See the \[reCAPTCHA docs\](https://developers.google.com/recaptcha/docs/display\#render\_param) for the list of accepted parameters. All parameters are accepted except for <code>sitekey</code>: Firebase Auth provisions a reCAPTCHA for each project and will configure the site key upon rendering.<!-- -->For an invisible reCAPTCHA, set the <code>size</code> key to <code>invisible</code>. |
+|  [TotpMultiFactorAssertion](./auth.totpmultifactorassertion.md#totpmultifactorassertion_interface) | The class for asserting ownership of a totp second factor. Provided by . |
+|  [TotpMultiFactorInfo](./auth.totpmultifactorinfo.md#totpmultifactorinfo_interface) | The subclass of the [MultiFactorInfo](./auth.multifactorinfo.md#multifactorinfo_interface) interface for TOTP second factors. The <code>factorId</code> of this second factor is [FactorId](./auth.md#factorid)<!-- -->.TOTP. |
 |  [User](./auth.user.md#user_interface) | A user account. |
 |  [UserCredential](./auth.usercredential.md#usercredential_interface) | A structure containing a [User](./auth.user.md#user_interface)<!-- -->, the [OperationType](./auth.md#operationtype)<!-- -->, and the provider ID. |
 |  [UserInfo](./auth.userinfo.md#userinfo_interface) | User profile information, visible only to the Firebase project's apps. |
@@ -1855,6 +1859,7 @@ An enum of factors that may be used for multifactor authentication.
 ```typescript
 FactorId: {
     readonly PHONE: "phone";
+    readonly TOTP: "totp";
 }
 ```