docs: noted --coverage aliased by --collectCoverage (#6741)

## Summary

Noting that `--coverage` maps to `--collectCoverage` in docs since the latter is not listed anywhere.

## Test plan

None necessary.

Author: Aghassi

docs/CLI.md

@@ -135,7 +135,7 @@ Alias: `-c`. The path to a Jest config file specifying how to find and execute t
 
 ### `--coverage`
 
-Indicates that test coverage information should be collected and reported in the output.
+Indicates that test coverage information should be collected and reported in the output. This option is also aliased by `--collectCoverage`.
 
 ### `--debug`