Update README.md

Author: jklj077

README.md

@@ -77,9 +77,9 @@ or
 ```
 mono nnmnist.exe <config.json>
 ```
-where <config.json> is a configuration file. There is [an example configuration file](./meprop%20(CSharp)/nnmnist/default.json) in the source codes. The output will be written to a file at the same location with the executable. The code supports random top-_k_ selection in addition.
+where <config.json> is a configuration file. There is [an example configuration file](./meprop%20(CSharp)/nnmnist/default.json) in the source codes. The output will be written to a file at the same location with the executable. The code supports random _k_ selection in addition.
 ### PyTorch
 ```bash
 python3.5 meprop (PyTorch).py
 ```
-The results will be written to stdout by default, but you can change the argument _file_ when initializing the _TestGroup_ to write the results to a file. The code supports simple unified meProp in addition. Please notice, this code will use GPU by default.
+The results will be written to stdout by default, but you can change the argument _file_ when initializing the _TestGroup_ to write the results to a file. The code supports simple unified meProp in addition. Please notice, this code will use GPU by default.