fix links

Author: despadam

05_object_oriented_programming.ipynb

@@ -415,7 +415,7 @@
     "These are also called **dunder methods**, that is, \"double-underscore methods\", because their names look like `__method__`.\n",
     "\n",
     "There are special **attributes** as well.\n",
-    "We will not cover them during this course, but you can read about them [here](https://docs.python.org/3/reference/datamodel.html#object.__lt__) if you want to."
+    "We will not cover them during this course, but you can read about them [here](https://docs.python.org/3/reference/datamodel.html#callable-types) if you want to."
    ]
   },
   {
@@ -1042,7 +1042,7 @@
     "\n",
     "Again, Python has special methods we can use to provide that functionality.\n",
     "\n",
-    "These are `__lt__`, `__gt__`, `__le__` methods. There are [many more](https://docs.python.org/3/reference/datamodel.html#callable-types)!"
+    "These are `__lt__`, `__gt__`, `__le__` methods. There are [many more](https://docs.python.org/3/reference/datamodel.html#object.__lt__)!"
    ]
   },
   {