formatting

Author: nikitinas

docs/StardustDocs/topics/add.md

@@ -48,7 +48,7 @@ You can use `newValue()` function to access value that was already calculated fo
 
 ```kotlin
 df.add("fibonacci") {
-    if(index() < 2) 1
+    if (index() < 2) 1
     else prev()!!.newValue<Int>() + prev()!!.prev()!!.newValue<Int>()
 }
 ```

tests/src/test/kotlin/org/jetbrains/kotlinx/dataframe/samples/api/Modify.kt

@@ -696,7 +696,7 @@ class Modify : TestBase() {
     fun addRecurrent() {
         // SampleStart
         df.add("fibonacci") {
-            if(index() < 2) 1
+            if (index() < 2) 1
             else prev()!!.newValue<Int>() + prev()!!.prev()!!.newValue<Int>()
         }
         // SampleEnd