README re. hooks

Author: JamesW1-NHS

README.specification.md

@@ -41,9 +41,7 @@ $ make install
 You can install some pre-commit hooks to ensure you can't commit invalid spec changes by accident. These are also run
 in CI, but it's useful to run them locally too.
 
-```
-$ make install-hooks
-```
+Note that this step is now done automatically in `make install` above. `make install-hooks` is no longer run.
 
 ### Environment Variables