Update deprecation message of row[col] syntax

Author: koperagen

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/util/deprecationMessages.kt

@@ -277,7 +277,7 @@ internal const val DEPRECATED_ACCESS_API =
     "It's recommended to migrate to the String or Extension Properties Access API https://kotlin.github.io/dataframe/apilevels.html"
 
 internal const val DEPRECATED_DATA_ROW_COLUMN_REFERENCE_GET =
-    "Accessing a DataRow by ColumnReference (row[col]) is deprecated. Prefer String or extension property access (e.g., row[\"name\"] or row.name). The reverse indexing col[row] remains supported."
+    "Accessing a DataRow by ColumnReference (row[col]) is deprecated. Prefer String or extension property access (e.g., row[\"name\"] or row.name). The reverse indexing col[row] and colAccessor.getValue(row) remains supported"
 
 internal const val IDENTITY_FUNCTION = "This overload is an identity function and can be omitted."