docs: correction to configuration parameter (#4587)

docs/guide/coverage.md

@@ -171,7 +171,7 @@ Since Vitest 0.31.0, you can check your coverage report in [Vitest UI](./ui).
 
 Vitest UI will enable coverage report when it is enabled explicitly and the html coverage reporter is present, otherwise it will not be available:
 - enable `coverage.enabled=true` in your configuration or run Vitest with `--coverage.enabled=true` flag
-- add `html` to the `coverage.reporters` list: you can also enable `subdir` option to put coverage report in a subdirectory
+- add `html` to the `coverage.reporter` list: you can also enable `subdir` option to put coverage report in a subdirectory
 
 <img alt="html coverage activation in Vitest UI" img-light src="/vitest-ui-show-coverage-light.png">
 <img alt="html coverage activation in Vitest UI" img-dark src="/vitest-ui-show-coverage-dark.png">