Merge pull request #806 from Kotlin/kdoc-processing-guide

Adding KDoc preprocessing guide

Author: Jolanrensen

CONTRIBUTING.md

@@ -96,6 +96,8 @@ has the best support for Kotlin, compiler plugins, Gradle, and [Kotlin Notebook]
 * We recommend using the [Ktlint plugin](https://plugins.jetbrains.com/plugin/15057-ktlint) for [IntelliJ IDEA](https://www.jetbrains.com/idea/download/).
 It is able to read the `.editorconfig` file and apply the same formatting rules as [Ktlint](https://pinterest.github.io/ktlint/latest/) in the CI.
 
+* Check out the [KDoc Preprocessor guide](KDOC_PREPROCESSING.md) to understand how to work with the KDoc preprocessor.
+
 ## Building
 
 This library is built with Gradle.

KDOC_PREPROCESSING.md

@@ -18,6 +18,7 @@ import org.jetbrains.kotlinx.dataframe.columns.SingleColumn
 import org.jetbrains.kotlinx.dataframe.columns.toColumnSet
 import org.jetbrains.kotlinx.dataframe.documentation.DocumentationUrls
 import org.jetbrains.kotlinx.dataframe.documentation.DslGrammarTemplateColumnsSelectionDsl.DslGrammarTemplate
+import org.jetbrains.kotlinx.dataframe.documentation.ExcludeFromSources
 import org.jetbrains.kotlinx.dataframe.documentation.Indent
 import org.jetbrains.kotlinx.dataframe.documentation.LineBreak
 import org.jetbrains.kotlinx.dataframe.documentation.SelectingColumns
@@ -48,12 +49,14 @@ internal interface Select {
 }
 
 /** {@set [SelectingColumns.OperationArg] [select][select]} */
+@ExcludeFromSources
 private interface SetSelectOperationArg
 
 /**
  * {@include [Select]}
  * ### This Select Overload
  */
+@ExcludeFromSources
 private interface CommonSelectDocs
 
 /**