Contributing: ktLintFormat -> detekt (mihonapp/mihon#1102)

* Contributing: ktLintFormat -> detekt

update Contributing info to use detekt instead of ktLintFormat

* Update CONTRIBUTING.md

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Co-authored-by: AntsyLich <59261191+AntsyLich@users.noreply.github.com>
(cherry picked from commit 14ae57d)

CONTRIBUTING.md

@@ -26,7 +26,7 @@ Before you start, please note that the ability to use following technologies is
 
 ## Linting
 
-To auto-fix some linting errors, run the `ktlintFormat` Gradle task.
+Run the `detekt` gradle task. If the build fails, a report of issues can be found in `app/build/reports/detekt/`. The report is availble in several formats and details each issue that needs attention. 
 
 ## Getting help