Update 1.2.1_assembly_video_lecture.md

Author: maltesie

_episodes/1.2.1_assembly_video_lecture.md

@@ -42,6 +42,6 @@ Watch the lecture video "Assembly strategies for genomics and metagenomics". It
 Additional reading: [Computational Biology: Genomes, Networks, Evolution MIT course 6.047/6.878 (Prof. Manolis Kellis)](https://ocw.mit.edu/ans7870/6/6.047/f15/MIT6_047F15_Compiled.pdf). This book is part of a course on Computational Biology and contains several topics that are relevant for Bioinformatics.
 
 > ## Read and summarize
-> Read the following sections and summarize shortly their key points in your lab book:
+> Read the following sections and summarize shortly (less than half a page per section) their key points in your lab book:
 > - "5.2 Genome Assembly I: Overlap-Layout-Consensus Approach" and "5.3 Genome Assembly II: String graph methods" (pages 93 to 102).
 {: .challenge}