Update Guideline.md

formatting

Author: maxxbw

Guideline.md

@@ -16,7 +16,7 @@ Bug Description
 
 - Code Change:
 
-```
+```diff
 diff --git a/util/src/main/java/com/psddev/dari/util/FormTag.java b/util/src/main/java/com/psddev/dari/util/FormTag.java
 index b473a60a..4d974c93 100644
 --- a/util/src/main/java/com/psddev/dari/util/FormTag.java
@@ -86,4 +86,4 @@ For each bug type _bug<sub>i</sub>_,
 	2. Identify if _C<sub>i</sub>_ is untangled or not. (see criteria as follow).
 	3. Record the result in _label.csv_. Also, briefly write down the reason for your judgment. Especially if it is untangled, briefly describe the solution. **Label as `U` (short for "Uncertain") if unsure**.
 
-**Note**, please take at least 10-mins break for every half an hour to mitigate tiredness factor.
+**Note**, please take at least 10-mins break for every half an hour to mitigate tiredness factor.