doc: Clarifies clava <-> yara usage with a better example.

README.md

@@ -65,13 +65,16 @@ and / or corpus of samples. The binaries can be downloaded from [here](https://v
 
 For example:
 ```sh
-# Generate a rule and store it in a file
-$ clava yara <path/to/sample> -o myrule.yar
-# Apply the yara rule on a directory
-$ yara myrule.yar my-malware-corpus/
-# Compile the yara rule for better performance
-$ yarac myrule.yar myrule-compiled
-$ yara -C myrule-compiled my-malware-corpus/
+# Create yara rule 'detect-evil.yara' for evil.exe:
+$ clava yara evil.exe -o detect-evil.yar
+
+# Check if any file in a corpus matches the generated rule:
+$ yara detect-evil.yar my-malware-corpus/
+
+# Tip: If you have a large corpus, you can compile the yara rule to
+# increase the performance:
+$ yarac detect-evil.yar detect-evil-compiled
+$ yara -C detect-evil-compiled my-malware-corpus/
 ```
 
 **Important:** Rules created with clava should **not** directly be used in production, but can assist during rule development. This project is heavily inspired by [yarGen](https://github.com/Neo23x0/yarGen), therefore see also Floriah Roth's [blog post](https://cyb3rops.medium.com/how-to-post-process-yara-rules-generated-by-yargen-121d29322282) *"How to post-process YARA rules generated by yarGen"*.