fix json error

Author: Litarnus

docs/security-legal-pii/scrubbing/server-side-scrubbing/index.mdx

@@ -36,7 +36,7 @@ Sentry will redact arrays and literal values, but also entire objects. For examp
 ```javascript
 credentials = {
   username: 'jane',
-  cats: ['pancake', 'maple', 'hellboy']
+  cats: ['pancake', 'maple', 'hellboy'],
   password: 'p4ssw0rd!',
   lastLogin: 'yesterday',
   ...