Fix typo (Qiskit/qiskit-tutorials#1095)

### Summary
Fix issue Qiskit/qiskit-tutorials#1095 

### Details and comments
Delete the wrong and meaningless part of the sentence ". which it has to do the same thing".

docs/tutorials/01_algorithms_introduction.ipynb

@@ -159,7 +159,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "So let's build a VQE instance passing the operator, and a backend using a QuantumInstance, to the constructor. Now VQE does have setters so the operator and backend can also be passed later. Setting them later can be useful when creating an algorithm without this problem specific information and then later using it, say with the chemistry application module, which would create the operator for the specific chemistry problem being solved. which it has to do the same thing.\n",
+    "So let's build a VQE instance passing the operator, and a backend using a QuantumInstance, to the constructor. Now VQE does have setters so the operator and backend can also be passed later. Setting them later can be useful when creating an algorithm without this problem specific information and then later using it, say with the chemistry application module, which would create the operator for the specific chemistry problem being solved.\n",
     "\n",
     "Note: In order that you can run this notebook and see the exact same output the random number generator used throughout Aqua in aqua_globals, as well as the transpiler and simulator, via the QuantumInstance, are seeded. You do not have to do this but if want to be able to reproduce the exact same outcome each time then this is how it's done.\n",
     "\n",