Remove the example of deprecated df.get

Author: koperagen

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

@@ -200,15 +200,7 @@ class Access : TestBase() {
 
     @Test
     @TransformDataFrameExpressions
-    fun getColumnsByName_properties() {
-        // SampleStart
-        df[df.age, df.weight]
-        // SampleEnd
-    }
-
-    @Test
-    @TransformDataFrameExpressions
-    fun getColumnsByName_strings() {
+    fun getColumnsByName() {
         // SampleStart
         df["age", "weight"]
         // SampleEnd

docs/StardustDocs/topics/select.md

@@ -4,29 +4,6 @@
 
 Two ways to create [`DataFrame`](DataFrame.md) with a subset of columns:
 
-**indexing:**
-
-<!---FUN getColumnsByName-->
-<tabs>
-<tab title="Properties">
-
-```kotlin
-df[df.age, df.weight]
-```
-
-</tab>
-<tab title="Strings">
-
-```kotlin
-df["age", "weight"]
-```
-
-</tab></tabs>
-<inline-frame src="resources/org.jetbrains.kotlinx.dataframe.samples.api.Access.getColumnsByName.html" width="100%"/>
-<!---END-->
-
-See [DataFrame indexing](indexing.md)
-
 **selecting:**
 
 <!---FUN select-->
@@ -52,3 +29,16 @@ df.select("age", "weight")
 **Related operations**: [remove](remove.md)
 
 See [column selectors](ColumnSelectors.md)
+
+**indexing:**
+
+<!---FUN getColumnsByName-->
+
+```kotlin
+df["age", "weight"]
+```
+
+<inline-frame src="resources/org.jetbrains.kotlinx.dataframe.samples.api.Access.getColumnsByName.html" width="100%"/>
+<!---END-->
+
+See [DataFrame indexing](indexing.md)