lab3: typo fix

Author: Nicceboy

Lab3_Botnets_and_malware/README.md

@@ -122,7 +122,7 @@ There are various tools for doing analysis partially for you, and we are going t
 
 Document files can be found from the zip file in [misc/malware](misc/malware) named **maldocs_task1.zip**. Password is *infected*
 
-> **warning**
+> **Warning**
 > Do not extract the zip files directly into the Windows machine. Antivirus might flag and remove them, even though there are not really malicious files. They just look like and include some patterns malicious files could have.
 
 ### Getting started