Document about auto-migration

Signed-off-by: sawadashota <[email protected]>

docs/docs/reference/configuration.md

@@ -1909,7 +1909,8 @@ hashers:
 
   ## Password hashing algorithm ##
   #
-  # One of the values: argon2, bcrypt
+  # One of the values: argon2, bcrypt.
+  # If database stores a password hashed by another algorithm, the password will be migrated to this algorithm when user logins using password flow.
   #
   # Default value: bcrypt
   #

embedx/config.schema.json

@@ -1767,7 +1767,7 @@
       "properties": {
         "algorithm": {
           "title": "Password hashing algorithm",
-          "description": "One of the values: argon2, bcrypt",
+          "description": "One of the values: argon2, bcrypt.\nIf database stores a password hashed by another algorithm, the password will be migrated to this algorithm when user logins using password flow.",
           "type": "string",
           "default": "bcrypt",
           "enum": [