Fixing alternate text for Figure 3

"algorithms" was mis-spelled as "algorthims"

Author: dandouthit

samples/core/get_started/eager.ipynb

@@ -557,7 +557,7 @@
         "<table>\n",
         "  <tr><td>\n",
         "    <img src=\"https://cs231n.github.io/assets/nn3/opt1.gif\" width=\"70%\"\n",
-        "         alt=\"Optimization algorthims visualized over time in 3D space.\">\n",
+        "         alt=\"Optimization algorithms visualized over time in 3D space.\">\n",
         "  </td></tr>\n",
         "  <tr><td align=\"center\">\n",
         "    <b>Figure 3.</b> Optimization algorithms visualized over time in 3D space. (Source: <a href=\"http://cs231n.github.io/neural-networks-3/\">Stanford class CS231n</a>, MIT License)<br/>&nbsp;\n",