docs: Add collectCoverage to Reference (#8996)

* docs: Add collectCoverage to Reference

Also noted how to override option set in Configuration

* docs: Add collectCoverage to CLI Reference

* docs: Move collectCoverage under coverage

* docs: Reword CHANGELOG update

CHANGELOG.md

@@ -47,6 +47,7 @@
 - `[*]` Add Node 12 to CI ([#8411](https://github.com/facebook/jest/pull/8411))
 - `[*]` [**BREAKING**] Upgrade to Micromatch v4 ([#8852](https://github.com/facebook/jest/pull/8852))
 - `[babel-plugin-jest-hoist]` [**BREAKING**] Use ESM exports ([#8874](https://github.com/facebook/jest/pull/8874))
+- `[docs]` Add alias and optional boolean value to `coverage` CLI Reference ([#8996](https://github.com/facebook/jest/pull/8996))
 - `[docs]` Fix broken link pointing to legacy JS file in "Snapshot Testing".
 - `[docs]` Add `setupFilesAfterEnv` and `jest.setTimeout` example ([#8971](https://github.com/facebook/jest/pull/8971))
 - `[jest]` [**BREAKING**] Use ESM exports ([#8874](https://github.com/facebook/jest/pull/8874))

docs/CLI.md

@@ -148,9 +148,9 @@ Forces test results output highlighting even if stdout is not a TTY.
 
 Alias: `-c`. The path to a Jest config file specifying how to find and execute tests. If no `rootDir` is set in the config, the directory containing the config file is assumed to be the rootDir for the project. This can also be a JSON-encoded value which Jest will use as configuration.
 
-### `--coverage`
+### `--coverage[=<boolean>]`
 
-Indicates that test coverage information should be collected and reported in the output. This option is also aliased by `--collectCoverage`.
+Alias: `--collectCoverage`. Indicates that test coverage information should be collected and reported in the output. Optionally pass `<boolean>` to override option set in configuration.
 
 ### `--debug`