chore: clarifies video pre-work details (#337)

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

lesson_11/README.md

@@ -5,7 +5,7 @@
 Please review the following resources before lecture:
 
 * [An Overview of Arrays and Memory (Data Structures & Algorithms #2) (Video)](https://www.youtube.com/watch?v=pmN9ExDf3yQ)
-* [Java Data Structures Tutorial (Video)](https://www.youtube.com/watch?v=8MmMm2-kJV8&t=206s)
+* [Java Data Structures Tutorial (Video)](https://www.youtube.com/watch?v=8MmMm2-kJV8&t=206s) - **NOTE**: Just the chapter on Arrays, between 3:26 and 17:37
 
 ## Homework