docs fix

Author: rishabhpoddar

v2/emailpassword/common-customizations/handling-signup-success.mdx

@@ -204,7 +204,7 @@ func main() {
 ```python
 from supertokens_python import init, InputAppInfo
 from supertokens_python.recipe import session, emailpassword
-from supertokens_python.recipe.emailpassword.interfaces import RecipeInterface, SignInOkResult
+from supertokens_python.recipe.emailpassword.interfaces import RecipeInterface, SignUpOkResult
 from typing import Dict, Any
 
 # highlight-start
@@ -219,7 +219,7 @@ def override_emailpassword_functions(original_implementation: RecipeInterface) -
     ):
         result = await original_sign_up(email, password, tenant_id, user_context)
 
-        if isinstance(result, SignInOkResult):
+        if isinstance(result, SignUpOkResult):
             id = result.user.user_id
             email = result.user.email
             print(id)