Visualizers: improve consistency

Author: mpsijm

spec/2023-07-draft.md

@@ -1261,19 +1261,19 @@ This information may be displayed to the user upon invocation of the validator.
 If a tool was used to automate creating test case illustrations,
 it is recommended to include the input visualizer source code in the directory `input_visualizer/`.
 
-The validator should be possible to use as follows on the command line:
+The input visualizer should be possible to use as follows on the command line:
 ```sh
 <input_visualizer_program> [inputfile] [answerfile] [arguments]
 ```
 
-Here, `arguments` is the `input_validator_args` key in the [test data configuration](#test-data-configuration) and [test case configuration](#test-case-configuration).
+Here, `arguments` is the `input_visualizer_args` key in the [test data configuration](#test-data-configuration) and [test case configuration](#test-case-configuration).
 
 Note that the visualizer would not typically be invoked by the judging system, the invocation instructions are mainly provided to ensure consistency between problem development tools.
 
 ## Output Visualizer
 
 An output visualizer is an optional [program](#programs) that is run after every invocation of the output validator in order to generate images illustrating the submission output.
-A visualizer program must be an application (executable or interpreted) capable of being invoked with a command line call. It is invoked using the same arguments as the output validator, except that `output_validator_args` is replaced with `output_visualizer_args`.
+An output visualizer program must be an application (executable or interpreted) capable of being invoked with a command line call. It is invoked using the same arguments as the output validator, except that `output_validator_args` is replaced with `output_visualizer_args`.
 It must be provided as a program (as specified [above](#programs)) in the directory `output_visualizer/`.
 
 All files written to the feedback directory by the output validator are accessible to the visualizer.