debug_backtrace(): Add omission hints to return values

* Add omission hints to return values

Co-authored-by: Jordi Kroon <jkroon@onyourmarks.agency>

Author: shaedrich

reference/errorfunc/functions/debug-backtrace.xml

@@ -162,7 +162,7 @@
        <entry>object</entry>
        <entry><type>object</type></entry>
        <entry>
-        The current <link linkend="language.oop5">object</link>.
+        The current <link linkend="language.oop5">object</link> if <constant>DEBUG_BACKTRACE_PROVIDE_OBJECT</constant> is given.
        </entry>
       </row>
       <row>
@@ -178,7 +178,7 @@
        <entry><type>array</type></entry>
        <entry>
         If inside a function, this lists the functions arguments. If
-        inside an included file, this lists the included file name(s).
+        inside an included file, this lists the included file name(s). Unless <constant>DEBUG_BACKTRACE_IGNORE_ARGS</constant> is given.
        </entry>
       </row>
      </tbody>