Clarify instruction for modifying y in Active Learning: Sizing a Canvas Box

[Ayushjsgithub]

Description:

Updated the instruction to explicitly mention assigning y a default value before using the addition assignment (+=) operator.
Prevents confusion by ensuring learners don’t assume everything must happen in one line.
Keeps the challenge intact while improving clarity.

Motivation:

The original instruction lacked clarity, leading learners to assume the modification should be done in a single line.
By explicitly stating the need to assign y a default value first, this change improves the accuracy and readability of the task.

Additional Details:

This change is in response to confusion noted by users in the community. Many are referencing this discussion thread, where contributor mikoMK (Michael) explained the issue, emphasizing the importance of understanding assignment operators and how they work. He pointed out that the instructions lacked clarity on the proper assignment of y, which led to confusion in solving the task.