Fix a doc issue causing a test failure (#9128)

Maybe it causes real docs problems too, I'm not sure.
Tests are super broken separate from this but I'm going to fix this
and force land it, so I can land the main fix cleanly and backport it.

Author: msullivan

docs/reference/running/deployment/note_cloud_reset_password.rst

@@ -4,6 +4,6 @@
     The administrator role name and its password used in the dump/restore process must be the same in both the instance dumped from and the instance restored to for the Gel tooling to continue functioning properly.
     To change the default password in the Cloud instance, execute the following query in the instance:
 
-    .. code-block:: edgeql-repl
+    .. code-block:: edgeql
 
         ALTER ROLE admin { set password := 'new_password' };

tests/test_docs.py

@@ -316,6 +316,7 @@ def run_block_test(self, block):
             lang = block.lang
             expect_invalid = False
 
+            code = []
             if lang.endswith('-repl'):
                 lang = lang.rpartition('-')[0]
                 code = self.extract_snippets_from_repl(block.code)