Minor fix in week1 exercises

Author: yammesicka

week1/1_Strings_and_Output.ipynb

@@ -285,7 +285,7 @@
    "source": [
     "<ol style=\"font-size: 1.25em; direction: ltr\">\n",
     "<li><code>\"Hello World\"</code></li>\n",
-    "<li><code>'Hello World\"</code></li>\n",
+    "<li><code>'Hello World'</code></li>\n",
     "<li><code>1234</code></li>\n",
     "<li><code>\"1234\"</code></li>\n",
     "<li><code>print(\"Hello World\")</code></li>\n",