Clarification of black poster chart paper.

Author: hokeun

src/Line.md

@@ -2,7 +2,7 @@
 
 The goal of this exercise is to program the Pololu robot in LF to perform track and line following, where the robot detects a line or track and follows it until it reaches the end.
 
-For this lab, you will need a suitable line like the ones below, made using black poster chart paper (cut out to the track) or black ducktape on white foam boards:
+For this lab, you will need a suitable line like the ones below, made using black poster chart paper (cut in the shape of the track) or black ducktape on white foam boards:
 
 <table>
 <tr>