DOC: Change "For attendees" to "Instructions for attendees", to make it a bit more obvious

README.md

@@ -20,7 +20,7 @@ The practicals have been written under the assumption that FSL 6.0.4 is
 installed.
 
 
-## For attendees
+## Instructions for attendees
 
 
 These notebooks can be run in the `fslpython` environment using:
@@ -40,7 +40,7 @@ directories, and click on the `.ipynb` file you are interested in.
 Have fun!
 
 
-## For contributors
+## Instructions for contributors
 
 
 The main Pytreat practical repository can be found at: