fix compilation

Author: koperagen

core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/Create.kt

@@ -6,8 +6,8 @@ import org.jetbrains.kotlinx.dataframe.api.add
 import org.jetbrains.kotlinx.dataframe.api.column
 import org.jetbrains.kotlinx.dataframe.api.columnGroup
 import org.jetbrains.kotlinx.dataframe.api.columnOf
-import org.jetbrains.kotlinx.dataframe.api.emptyDataFrame
 import org.jetbrains.kotlinx.dataframe.api.dataFrameOf
+import org.jetbrains.kotlinx.dataframe.api.emptyDataFrame
 import org.jetbrains.kotlinx.dataframe.api.filter
 import org.jetbrains.kotlinx.dataframe.api.frameColumn
 import org.jetbrains.kotlinx.dataframe.api.map
@@ -203,7 +203,7 @@ class Create : TestBase() {
     @Test
     fun createEmptyDataFrame() {
         // SampleStart
-        val df = emptyDataFrame()
+        val df = emptyDataFrame<Any>()
         // SampleEnd
         df.columnsCount() shouldBe 0
         df.rowsCount() shouldBe 0

docs/StardustDocs/topics/createDataFrame.md

@@ -10,7 +10,7 @@ Returns [`DataFrame`](DataFrame.md) with no rows and no columns.
 <!---FUN createEmptyDataFrame-->
 
 ```kotlin
-val df = emptyDataFrame()
+val df = emptyDataFrame<Any>()
 ```
 
 <!---END-->

docs/StardustDocs/topics/replace.md

@@ -23,5 +23,7 @@ df.replace { age }.with { 2021 - age named "year" }
 <!---END-->
 
 <tip>
+
 `replace { columns }.with { columnExpression } ` is equivalent to `convert { columns }.to { columnExpression }`. See [`convert`](convert.md) for details.
+
 </tip>