jobsub README: fixed parameter name

jobsub/README.md

@@ -70,7 +70,7 @@ The section of a configuration file template with variable geometry file and DUT
 ```toml
 [Corryvreckan]
 detectors_file = "@telescopeGeometry@"
-histogramFile = "histograms_@RunNumber@.root"
+histogram_file = "histograms_@RunNumber@.root"
 
 number_of_events = 5000000
 
@@ -148,4 +148,4 @@ Complicated and error-prone `transfer_output_files` commands can be avoided. It
 ```
 output_directory = "/afs/cern.ch/user/y/yourname/whateveryouwant/run@RunNumber@"
 ```
-directly in the Corryvreckan config file.
\ No newline at end of file
+directly in the Corryvreckan config file.