Spelling misstakes corrected

README_dev.md

@@ -73,8 +73,7 @@ See the `--help` flag for more information about all the available flags.
 
 ### Performing a test of developed behaviours.
 
-Three behaviours, based on mixed integer programming, reinforcement learning and algorithm selection,
-have been devolped specifically to be analysed and evaluated in this environment.
+Three behaviours, based on mixed integer programming, reinforcement learning and algorithm selection, have been developed specifically to be analysed and evaluated in this environment.
 To run a test that pitches these three behaviours against all other available behaviours, use the file [run_testing.sh](run_testing.sh).
 There are some environment variables in the file that can be used to configure a run.