convert ktlint format

Author: AndreiKingsley

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

@@ -32,7 +32,6 @@ import org.jetbrains.kotlinx.dataframe.documentation.DslGrammarLink
 import org.jetbrains.kotlinx.dataframe.documentation.ExcludeFromSources
 import org.jetbrains.kotlinx.dataframe.documentation.ExpressionsGivenDataFrame
 import org.jetbrains.kotlinx.dataframe.documentation.ExpressionsGivenRow
-import org.jetbrains.kotlinx.dataframe.documentation.ExpressionsGivenRowAndColumn
 import org.jetbrains.kotlinx.dataframe.documentation.Indent
 import org.jetbrains.kotlinx.dataframe.documentation.LineBreak
 import org.jetbrains.kotlinx.dataframe.documentation.SelectingColumns
@@ -368,7 +367,6 @@ public class Convert<T, out C>(internal val df: DataFrame<T>, internal val colum
  */
 public fun <T> Convert<T, *>.to(type: KType): DataFrame<T> = to { it.convertTo(type) }
 
-
 /**
  * Converts values in the columns previously selected with [convert]
  * using [columnConverter] expression within the [DataFrame].