Fix a few typos

Author: fuglede

notebooks/05.06-Linear-Regression.ipynb

@@ -174,7 +174,7 @@
  "where there are multiple $x$ values.\n",
  "Geometrically, this is akin to fitting a plane to points in three dimensions, or fitting a hyper-plane to points in higher dimensions.\n",
  "\n",
- "The multidimensional nature of such regressions make them more difficult to visualize, but we can see one of these fits in action by building some example data, using NumPy's matrix multiplication operator:"
+ "The multidimensional nature of such regressions makes them more difficult to visualize, but we can see one of these fits in action by building some example data, using NumPy's matrix multiplication operator:"
  ]
  },
  {
@@ -225,7 +225,7 @@
  "$$\n",
  "y = a_0 + a_1 x_1 + a_2 x_2 + a_3 x_3 + \\cdots\n",
  "$$\n",
- "and build the $x_1, x_2, x_3,$ and so on. from our single-dimensional input $x$.\n",
+ "and build the $x_1, x_2, x_3,$ and so on, from our single-dimensional input $x$.\n",
  "That is, we let $x_n = f_n(x)$, where $f_n()$ is some function that transforms our data.\n",
  "\n",
  "For example, if $f_n(x) = x^n$, our model becomes a polynomial regression:\n",