Update JOJ3 Configuration For TAs

JOJ3-Configuration-For-TAs.md

@@ -111,14 +111,22 @@ the next table is defined.
   - `limit.stdout [int]`: default `stdout` size applicable to the stage in kB (default: `4`)
   - `limit.stderr [int]`: default `stderr` size applicable to the stage in kB (default: `4`)
 
+### Online judge options
+
+While online judge stages work  in a similar way as other stages, they often feature more than one  step. For instance, while a compilation or code quality stage 
+is composed of a single step where the code is compiled or analysed, an online judge stage can features many steps, each corresponding to a test-case.
+Therefore, on-top of the regular stage options, online-judge stages can be adjusted at "step level ", ie. for each test-case.
 
 Any online-judge stage *must* feature the keyword `judge`, eg. `judge`, `judge-base`, `asan-judge` are all valid online-judge 
 stage names while `oj`, `run-base`, and `asan` are not. 
 
-An online-judge stage is configure as any other stage, ie. using the above options, but can feature an
+The following extra option is available for online-judge stages: 
-extra parameter:
 - `skip [array of string]`: list of test cases to skip for this stage (default: `[ ]`)
 
+For each step, ie. test-case, the following configuration can be adjusted:
+- `limit.cpu [int]`: maximum running time for the stage in sec (default: `4`)
+- `limit.mem [int]`: maximum amount of RAM allowed for the stage in MB (default: `4`)
+
 
 ### Parsers