Update README.md

State more precisely what `--nocompiler` is doing.

Author: AndreasGocht

README.md

@@ -236,12 +236,14 @@ The traditional `--mpi` does still work, and is similar to the following call:
 python -m scorep --compiler --thread=pthread --mpp=mpi <script.py>
 ```
 
-To disable compiler instrumentation, please specify:
+To disable compiler interface, please specify:
 
 ```
 python -m scorep --nocompiler <script.py>
 ```
 
+However, this will not remove any compiler instrumentation in any binary.
+
 For other thread schemes just specify `--thread=<something>`.
 E.g. :