update docs

docs/pages/examples/totp.md

@@ -4,16 +4,17 @@ title: "Time-based one-time passwords"
 
 # Time-based one-time passwords
 
-Use [`generateTOTP()`](/reference/main/generateTOTP) and [`verifyTOTP()`](/reference/main/verifyTOTP) to generate and verify HOTPs.
+Use [`generateTOTP()`](/reference/main/generateTOTP) to generate TOTPs and use [`verifyTOTPWithGracePeriod()`](/reference/main/verifyTOTPWithGracePeriod) or [`verifyTOTP()`](/reference/main/verifyTOTP) to verify them. Adding a grace period allows you to account for network latency and time discrepancy between devices.
 
 ```ts
-import { generateTOTP, verifyTOTP } from "@oslojs/otp";
+import { generateTOTP, verifyTOTPWithGracePeriod, verifyTOTP } from "@oslojs/otp";
 
 const digits = 6;
 const intervalInSeconds = 30;
 
 const otp = generateTOTP(key, intervalInSeconds, digits);
-const validOTP = verifyTOTP(key, intervalInSeconds, digits, otp);
+const valid = verifyTOTPWithGracePeriod(key, intervalInSeconds, digits, otp, 30);
+const valid = verifyTOTP(key, intervalInSeconds, digits, otp);
 ```
 
 Use [`createTOTPKeyURI()`](/reference/main/createTOTPKeyURI) to create a key URI, which are then usually encoded into a QR code.

docs/pages/reference/main/verifyTOTPWithGracePeriod.md

@@ -2,6 +2,8 @@
 title: "verifyTOTPWithGracePeriod()"
 ---
 
+# verifyTOTPWithGracePeriod()
+
 Verifies a TOTP using [`verifyTOTP()`](/reference/main/verifyTOTP) with a grace period. If the grace period is 30 seconds for example, the OTP is valid if it was generated within the 30-second time span before or after the current machine time (60 seconds in total).
 
 ```ts