Update docs/usage/screening.md

Co-authored-by: Júlia Mir Pedrol <[email protected]>

docs/usage/screening.md

@@ -97,7 +97,7 @@ Running MAGeCK MLE and BAGEL2 with a contrast file will also output a Venn diagr
 
 ### MAGeCK RRA
 
-MAGeCK RRA performs robust ranking aggregation to identify genes that are consistently ranked highly across multiple replicate screens. To run MAGeCK RRA, you can define the contrasts as previously stated in the last section with --contrasts <<your_file.txt>>(with a `.txt` extension) and also specify `--rra`.
+MAGeCK RRA performs robust ranking aggregation to identify genes that are consistently ranked highly across multiple replicate screens. To run MAGeCK RRA, you can define the contrasts as previously stated in the last section with `--contrasts` <<your_file.txt>> (with a `.txt` extension) and also specify `--rra`.
 
 ### Running MAGeCK MLE only