Improved Documentation

Added some doc tests as examples.

tests/klocalizedcontext_tests.rs

@@ -2,14 +2,6 @@ use ki18n_rs::klocalizedcontext::KLocalizedContext;
 use qmetaobject::prelude::*;
 mod common;
 
-#[test]
-fn init_engine() {
-    let _lock = common::lock_for_test();
-
-    let engine = QmlEngine::new();
-    KLocalizedContext::init_from_engine(&engine);
-}
-
 #[test]
 fn cpp_ptr() {
     let _lock = common::lock_for_test();

tests/klocalizedstring_tests.rs

@@ -8,7 +8,6 @@ fn application_domain() {
 
     KLocalizedString::set_application_domain(&domain);
     let domain = KLocalizedString::application_domain();
-    println!("{:#?}", domain);
 
     assert_eq!(domain.to_str().unwrap(), "KI18n");
 }