Tweak description of experimental script prerequisites

Author: mernst

scripts/experiment-scripts/README.md

@@ -14,7 +14,7 @@ figures and tables.
 
 To set up the environment, refer to the `scripts/prerequisites.md` file.
 
-## Running Scripts
+### Running Scripts
 
 To generate the desired figures or tables from the paper, run the corresponding
 shell script. For example, to generate **Figure 7**, use:

scripts/prerequisites.md

@@ -46,19 +46,17 @@ cd scripts
 ./get-all-subject-src.sh
 ```
 
-## Environment variables
+## Adding Defects4J to PATH
 
-### Adding Defects4J to PATH
-
-Add Defects4J's executables to your PATH in
+For defect detection scripts, add Defects4J's executables to your PATH in
 the shell session where you run the scripts:
 
 ```sh
 export PATH="$PATH":"$PATH2DEFECTS4J/framework/bin"
 ```
 
-> "PATH2DEFECTS4J" points to the directory which Defects4J is in; it most
-> likely will look like "currentdirectory/build/defects4j".
+where "PATH2DEFECTS4J" points to the directory which Defects4J is in; it most
+likely will look like "currentdirectory/build/defects4j".
 
 ### Java Versions Setup