Update Styleguide file (#5435)

Task/Issue URL:
https://app.asana.com/0/1202552961248957/1209069202192275

### Description
Update styleguide to match current state.

CONTRIBUTING.md

@@ -50,6 +50,6 @@ If your PR is failing because of that, please make sure that you follow our [sty
 You can also trigger an automatic code formatting of the code by executing:
 
 ```
-./gradleW app:spotlessApply
+./gradleW code_format_checks
 ./gradleW formatKotlin
 ```

STYLEGUIDE.md

@@ -5,19 +5,12 @@
 
 ###  Code formatting
 
-To adhere to codestyle, please run `./gradlew spotlessApply` to autoformat in order to fix any CI issues.
+You can check the code formatting correctness by running `./gradleW code_format_checks`.
+To adhere to codestyle, please run `./gradleW formatKotlin` and `./gradleW spotlessApply` to autoformat in order to fix any CI issues.
 
-If you want to do this automatically upon commit we recommend the following `pre-commit` hook.
-
-```bash
-❯ cat .git/hooks/pre-commit
-./gradlew :app:spotlessApply
-git add `git diff --name-only`
-exit 0
-```
-
-If you want to reformat code whilst writing it, please make sure you have installed and enabled 
-the [IntelliJ Ktfmt plugin](https://plugins.jetbrains.com/plugin/14912-ktfmt), with Dropbox Style selected.
+If you want to do this automatically upon commit we recommend the existing [pre-commit hook](.githooks/pre-commit):
+- Pull develop branch
+- Execute the following command `git config core.hooksPath .githooks` in the terminal
 
 ##  Code conventions