test changing sources

Author: Jolanrensen

.github/workflows/generated-sources.yml

@@ -50,5 +50,5 @@ jobs:
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
-              body: "KDocs have been updated. Please check the changes at [this branch](https://github.com/${{ github.repository }}/tree/docs-update-${{ github.run_number }})",
+              body: "Generated sources have been updated. Please check the changes at [this branch](https://github.com/${{ github.repository }}/tree/docs-update-${{ github.run_number }})",
             })

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/add.kt

@@ -28,7 +28,7 @@ import kotlin.reflect.KProperty
 
 // region Add existing columns
 
-/**
+/** TEST
  * Creates new [DataFrame] with given columns added to the end of original [DataFrame.columns] list.
  *
  * Original [DataFrame] is not modified.