Resolved issue with wrong use of parenthesis

Author: kazakhpunk

core/numpy/numpy-basics.ipynb

@@ -700,7 +700,7 @@
    "source": [
     "### Slices\n",
     "\n",
-    "Slicing syntax is written as `array[start:stop:step]'. Note that **all numbers are optional**. Importantly, the **step** parameter is optional and can be omitted, in which case the slice uses a default step of 1.\n",
+    "Slicing syntax is written as `array[start:stop:step]`. Note that **all numbers are optional**. Importantly, the **step** parameter is optional and can be omitted, in which case the slice uses a default step of 1.\n",
     "- defaults: \n",
     "  - start = 0\n",
     "  - stop = len(dim)\n",