Document strict parameter

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/object/PythonObjectLibrary.java

@@ -590,6 +590,7 @@ public int asFileDescriptor(Object receiver) {
      * @param receiver self
      * @param name attribute name
      * @param inheritedOnly determines whether the lookup should start on the class or on the object
+     * @param strict whether to raise {@code AttributeError} when the attribute is not found
      */
     public Object lookupAttribute(Object receiver, String name, boolean inheritedOnly, boolean strict) {
         CompilerDirectives.transferToInterpreterAndInvalidate();