fixed "go edit" command

[kartikPatidar]

Under Tutorial/call-module-code.html in line 144, fixed the "go edit -replace" command which was incorrect or had a typo.

from : $ go mod edit -replace=example.com/greetings=../greetings
to : $ go mod edit -replace example.com/greetings=../greetings

removed "=" after "-replace".
Beginners might be running in errors because of this. (Accept this PR immediately).

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