Fixes in kdocs

Author: nikitinas

src/main/kotlin/org/jetbrains/kotlinx/dataframe/DataColumn.kt

@@ -37,7 +37,7 @@ import kotlin.reflect.typeOf
  * Base interface for [ValueColumn] and [FrameColumn], but not for [ColumnGroup]. However, implementations for all three [column kinds][ColumnKind] derive from DataColumn and can cast to it safely.
  * Column operations that have signature clash with [DataFrame] API ([filter], [take], [map] etc.) are defined for [DataColumn] and not for [BaseColumn].
  *
- * @param T - type of values in the column.
+ * @param T type of values in the column.
  */
 public interface DataColumn<out T> : BaseColumn<T> {
 

src/main/kotlin/org/jetbrains/kotlinx/dataframe/columns/BaseColumn.kt

@@ -15,7 +15,7 @@ import kotlin.reflect.KType
  * Base interface for all three kinds of columns: [ValueColumn], [ColumnGroup] and [FrameColumn].
  * Column operations that doesn't clash by signature with [DataFrame] operations can be defined for [BaseColumn]
  *
- * @param T - type of values contained in column.
+ * @param T type of values contained in column.
  */
 public interface BaseColumn<out T> : ColumnReference<T> {
 

src/main/kotlin/org/jetbrains/kotlinx/dataframe/columns/FrameColumn.kt

@@ -7,7 +7,7 @@ import org.jetbrains.kotlinx.dataframe.schema.DataFrameSchema
 /**
  * Column that stores values of type [DataFrame]
  *
- * @param T - schema marker of contained dataframes. See [DataFrame] for details.
+ * @param T schema marker of contained dataframes. See [DataFrame] for details.
  */
 public interface FrameColumn<out T> : DataColumn<DataFrame<T>> {