Update README.md

Author: mcarbonneaux

README.md

@@ -21,7 +21,7 @@ You must have compiled and installed:
 
 - [libmemcache](https://github.com/richp10/libmemcache-1.4.0.rc2-patched) the C client API needed to compile the Apache Module.
 
-Attention: Don't mix up libmemcache and libmemcached!
+> **Attention:** Don't mix up `libmemcache` and `libmemcached`!
 
 # How to build