Update assignment3.md

assignments/assignment3.md

 
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 # Assignment 3
 
 Hey there! Welcome to Knowledge Lens Intern Training Program.
@@ -143,7 +142,6 @@ Sample Document:
 
 ### :books: Description
 
-# Description
 Data from different sites will be pushed with frequency of 10 seconds for the parameters PM10,PM2.5,SO2,NO2 via mqtt.
 
 data can be of different quality - Good ( 0 ), Maintainance ( 1 ), Error ( 2 )