Suppress org.intellij.lang.annotations from Dokka output.

These classes are added manually to JS/Native source sets to support `@Language` annotation for IDE in the common source and should not be exposed in documentation.

Author: sandwwraith

gradle/dokka.gradle

@@ -66,6 +66,12 @@ subprojects {
                     reportUndocumented.set(false)
                     skipDeprecated.set(true)
                 }
+
+                // JS/Native implementation of JVM-only `org.intellij.lang.annotations.Language` class to add syntax support by IDE.
+                perPackageOption {
+                    matchingRegex.set("org\\.intellij\\.lang\\.annotations(\$|\\.).*")
+                    suppress.set(true)
+                }
             }
         }
     }