fix: minor typo

Author: HarrisonKramer

docs/examples/Tutorial_1e_Non_Rotationally_Symmetric_Systems.ipynb

@@ -71,7 +71,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    " - To rotate a surface (say, tilt about the x axis), you need to pass the parameter `rx=...` in the `add_surface()` method. The same applies to the tilt about Y or tilt about Z, and their corresponding paramters are ry, and rz, respectively. The default units of rotation of a surface are radians, which means that if you prefer to specify the rotation in degrees, you must use, for example for a 45 degree rotation about X, the parameter `rx=np.radians(45)`. \n",
+    " - To rotate a surface (say, tilt about the x axis), you need to pass the parameter `rx=...` in the `add_surface()` method. The same applies to the tilt about Y or tilt about Z, and their corresponding parameters are ry, and rz, respectively. The default units of rotation of a surface are radians, which means that if you prefer to specify the rotation in degrees, you must use, for example for a 45 degree rotation about X, the parameter `rx=np.radians(45)`. \n",
     " - You must not pass `thickness` after defining an `x`, `y`, `z` position for a previous surface. Hence, if you want to design systems with coordinate breaks, the best approach is to always specify the location of the surfaces using their (x,y,z) coordinates, instead of `thickness`.\n",
     "\n"
    ]
@@ -307,7 +307,7 @@
    "metadata": {},
    "source": [
     "**Conclusion:** <br>\n",
-    "We have explored the surfaces' coordinate systems in Optiland, as well as provinding two approaches to design complex optical systems which involve several changes in coordinates, as it happens with folding mirrors. The first approach presents itself as a more intuitive method, since we are effectively localizing each surface according to its coordinate system in the 3D space. The second approach, however, involves considering that after folding mirrors, the translation happens in another axis and special care is needed to ensure the correct modelling of the system. "
+    "We have explored the surfaces' coordinate systems in Optiland, as well as providing two approaches to design complex optical systems which involve several changes in coordinates, as it happens with folding mirrors. The first approach presents itself as a more intuitive method, since we are effectively localizing each surface according to its coordinate system in the 3D space. The second approach, however, involves considering that after folding mirrors, the translation happens in another axis and special care is needed to ensure the correct modelling of the system. "
    ]
   }
  ],