Disclaim if you haven't fully tested a suggestion

Clarify if you haven't tested a code suggestion or got an information from an unofficial source like an LLM or blog post.

Author: MatheusRich

code-review/README.md

@@ -36,6 +36,11 @@ Watch a presentation that covers this material from [Derek Prior at RailsConf 20
 - **Be humble**
   - "I'm not sure - let's look it up."
 
+- **Disclaim if you haven't fully tested a suggestion**
+  - "I think we can rewrite this as \<suggestion\>, but I haven't tested it."
+  - This applies to code and information in general.
+  - Be cautious with information you didn't get from official sources.
+
 - **Don't use hyperbole**
   - "Always", "never", "endlessly", "nothing"