fix: fixed documentation

Author: modelrailroader

docs/optional-configuration.md

@@ -7,15 +7,15 @@ title: Optional Configuration
 
 The instance (`new TwoFactorAuth()`) can only be configured by the constructor with the following optional arguments
 
-Argument          | Default value | Use
-------------------|---------------|-----
-`$issuer`         | `null`        | Will be displayed in the users app as the default issuer name when using QR code to import the secret
-`$digits`         | `6`           | The number of digits the resulting codes will be
-`$period`         | `30`          | The number of seconds a code will be valid
-`$algorithm`      | `'sha1'`      | The algorithm used (one of `sha1`, `sha256`, `sha512`, `md5`)
-`$qrcodeprovider` | `null`        | QR-code provider
-`$rngprovider`    | `null`        | Random Number Generator provider
-`$timeprovider`   | `null`        | Time provider
+Argument          | Default value     | Use
+------------------|-------------------|-----
+`$issuer`         | `null`            | Will be displayed in the users app as the default issuer name when using QR code to import the secret
+`$digits`         | `6`               | The number of digits the resulting codes will be
+`$period`         | `30`              | The number of seconds a code will be valid
+`$algorithm`      | `Algorithm::Sha1` | The algorithm used (one of `Algorithm::Sha1`, `Algorithm::Sha256`, `Algorithm::Sha512`, `Algorithm::md5`)
+`$qrcodeprovider` | `null`            | QR-code provider
+`$rngprovider`    | `null`            | Random Number Generator provider
+`$timeprovider`   | `null`            | Time provider
 
 **Note:** the default values for `$digits`, `$period`, and `$algorithm` provide the widest variety of support amongst common authenticator apps such as Google Authenticator. If you choose to use different values for these arguments you will likely have to instruct your users to use a specific app which supports your chosen configuration.