change player auth identifier docs

Author: tudddorrr

docs/godot/player-authentication.mdx

@@ -152,7 +152,13 @@ else:
 
 <ScopeBadges scope='players' read write />
 
-You can also change a player's email with the `Talo.player_auth.change_email()` function - just pass in their current password and a new email.
+You can change a player's email with the `Talo.player_auth.change_email()` function - just pass in their current password and a new email.
+
+## Changing a player's identifier
+
+<ScopeBadges scope='players' read write />
+
+You can change a player's identifier with the `Talo.player_auth.change_identifier()` function - just pass in their current password and a new identifier.
 
 ## Forgotten password flow
 

docs/http/player-auth-api.mdx

@@ -81,7 +81,7 @@ When trying to verify a player login, this error is thrown if the `code` is not
 
 ### `IDENTIFIER_TAKEN`
 
-When trying to create a new player, this error is thrown if the `identifier` is already taken.
+When trying to create a new player or update an existing player's identifier, this error is thrown if the `identifier` is already taken.
 
 ```javascript
 {
@@ -134,6 +134,17 @@ When trying to change a player's email address, this error is thrown if the new
 }
 ```
 
+### `NEW_IDENTIFIER_MATCHES_CURRENT_IDENTIFIER`
+
+When trying to change a player's identifier, this error is thrown if the new identifier matches the current identifier.
+
+```javascript
+{
+  message: 'Please choose a different identifier',
+  errorCode: 'NEW_IDENTIFIER_MATCHES_CURRENT_IDENTIFIER'
+}
+```
+
 ### `PASSWORD_RESET_CODE_INVALID`
 
 When trying to reset a player password, this error is thrown if the reset code is incorrect or has expired.

docs/unity/player-authentication.mdx

@@ -206,7 +206,13 @@ catch (Exception ex)
 
 <ScopeBadges scope='players' read write />
 
-You can also change a player's email with the `Talo.PlayerAuth.ChangeEmail()` function - just pass in their current password and a new email.
+You can change a player's email with the `Talo.PlayerAuth.ChangeEmail()` function - just pass in their current password and a new email.
+
+## Changing a player's identifier
+
+<ScopeBadges scope='players' read write />
+
+You can change a player's identifier with the `Talo.PlayerAuth.ChangeIdentifier()` function - just pass in their current password and a new identifier.
 
 ## Forgotten password flow