Missed one typo

Author: Ethan Manilow

book/basics/evaluation.ipynb

@@ -57,7 +57,7 @@
     "are in terms of decibels (dB), with higher values being better.\n",
     "To calculate they require access to the ground truth isolated sources and\n",
     "are usually calculated on a signal that has been divided into short\n",
-    "windows of a new seconds long. \n",
+    "windows of a few seconds long. \n",
     "\n",
     "\n",
     "**Source-to-Artifact Ratio (SAR)**\n",