Utils: Change SmallString::toView to SmallString::toStringView

This improves the readability of the code.

Change-Id: Ifccbaaa6003636848ea48e00d92abc44f5c2e0f1
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

tests/unit/unittest/smallstring-test.cpp

@@ -1687,7 +1687,7 @@ TEST(SmallString, ToView)
 {
     SmallString text = "text";
 
-    auto view = text.toView();
+    auto view = text.toStringView();
 
     ASSERT_THAT(view, "text");