docs: fix typo in BUG.md (#567)

Author: snitin315

.github/ISSUE_TEMPLATE/BUG.md

@@ -16,7 +16,7 @@ about: Something went awry and you'd like to tell us about it.
 
 ### Actual Behavior
 
-<!-- Explain exactly how it behave -->
+<!-- Explain exactly how it behaves -->
 
 ### Expected Behavior