docs: fix by proofreading

Co-authored-by: John Paul E. Balandan, CPA <51850998+paulbalandan@users.noreply.github.com>

Author: kenjis

user_guide_src/source/libraries/security.rst

@@ -47,7 +47,7 @@ You can set to use the Session based CSRF protection by editing the following co
 Token Randomization
 -------------------
 
-To mitigate compression side-channel attacks like `BREACH`_, and prevent an attacker from guessing the CSRF tokens, you can configure token randomization (default off).
+To mitigate compression side-channel attacks like `BREACH`_, and prevent an attacker from guessing the CSRF tokens, you can configure token randomization (off by default).
 
 If you enable it, a random mask is added to the token and used to scramble it.