formatHeader docs korro and sample

Author: AndreiKingsley

docs/StardustDocs/topics/_shadow_resources.md

@@ -179,6 +179,7 @@
 <resource src="notebook_test_any_3.html"></resource>
 <resource src="notebook_test_associate_1.html"></resource>
 <resource src="notebook_test_associateBy_1.html"></resource>
+<resource src="formatHeader.html"></resource>
 <resource src="notebook_test_rename_3.html"></resource>
 <resource src="notebook_test_rename_4.html"></resource>
 <resource src="notebook_test_rename_5.html"></resource>

docs/StardustDocs/topics/format.md

@@ -149,5 +149,17 @@ Formats the specified column headers.
 
 <!---FUN formatHeader-->
 
+```kotlin
+df
+    // Format all column headers with bold
+    .formatHeader().with { bold }
+    // Format the "name" column (including nested) header with red text
+    .formatHeader { name }.with { textColor(red) }
+    // Override "name"/"lastName" column formating header with blue text
+    .formatHeader { name.lastName }.with { textColor(blue) }
+    // Format all numeric column headers with underlines
+    .formatHeader { colsOf<Number?>() }.with { underline }
+```
+
 <!---END-->
 <inline-frame src="resources/formatHeader.html" width="100%"/>

samples/build.gradle.kts

@@ -118,6 +118,7 @@ korro {
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/*.kt")
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/*.kt")
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/utils/*.kt")
+        include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/render/*.kt")
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/collectionsInterop/*.kt")
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/column/*.kt")
         include("src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/info/*.kt")