voltage angles are now known

Signed-off-by: Sander-Timmerman <sander.timmerman@alliander.com>

Author: Sander-Timmerman

state-estimation-assignment/State Estimation Assignment.ipynb

@@ -309,7 +309,7 @@
    "source": [
     "# Assignment 5: Add power sensors to the model\n",
     "\n",
-    "In common power grids most voltage sensors only measure the voltage magnitude; not the angle. In this assigment we will again use the `input_data` of assignment 3 (with unknown voltage angles) and we will connect power sensors to the model.\n",
+    "In common power grids most voltage sensors only measure the voltage magnitude; not the angle. In this assigment we will again use the `input_data` of assignment 3 and we will connect power sensors to the model.\n",
     "\n",
     "In our network it would be possible to connect power sensors to the lines, the loads and the source. To assign realistic measurement values to the power sensors we can use the powerflow output.\n",
     "\n",