Uodate info on vector-sum graphing on Ch 2 intro

Author: jmshea

02-vectors/intro.ipynb

@@ -17,10 +17,10 @@
     "\n",
     "**Interactive elements:**\n",
     "* {doc}`Section 2.1: Introduction to Vectors<1-vectors>` (interactive questions and flashcards)\n",
-    "* {doc}`Section 2.2: Visualizing Vectors<2-visualizing>` (interactive vector graphing)\n",
+    "* {doc}`Section 2.2: Visualizing Vectors<2-visualizing>` (interactive vector graphing, questions, and flashcards)\n",
     "* {doc}`Section 2.3: Applications<3-applications>`  (interactive questions and flashcards)\n",
     "* {doc}`Section 2.4: Special Vectors<4-special-vectors>`  (interactive questions and flashcards)\n",
-    "* {doc}`Section 2.5: Vector Operations<5-vector-ops>`  (interactive questions and flashcards)\n",
+    "* {doc}`Section 2.5: Vector Operations<5-vector-ops>`  (interactive vector-sum graphing, questions, and flashcards)\n",
     "* {doc}`Section 2.6: Vector Correlation and Projection<6-correlation-projection>` (interactive questions and flashcards)\n",
     "* {doc}`Section 2.7: Chapter Summary<7-summary>` (interactive questions and flashcards)"
    ]