Fix a missing " character in the password documentation

docs/topics/auth/passwords.txt

@@ -113,7 +113,7 @@ algorithm.
     the compute powered required to brute force bcrypt in any useful amount of
     time is still astronomical. Nonetheless, we recommend you use
     ``BCryptSHA256PasswordHasher`` anyway on the principle of "better safe than
-    sorry.
+    sorry".
 
 .. admonition:: Other bcrypt implementations