fix: Use reserved example.com as bogus instead of email.com domain. (#2551)

`email.com` is not a reserved domain, incorrect configuration could result in unintentional effects.
`example.com` is reserved by IANA for bogus purposes, see RFC 6761.

mealie/schema/user/user.py

@@ -89,7 +89,7 @@ class UserBase(MealieModel):
             "example": {
                 "username": "ChangeMe",
                 "fullName": "Change Me",
-                "email": "changeme@email.com",
+                "email": "changeme@example.com",
                 "group": settings.DEFAULT_GROUP,
                 "admin": "false",
             }