Fixed syntax error in the code under What's new in v3 heading

[neelkanth-kaushik]

Under the heading https://segment.com/docs/connections/sources/catalog/libraries/server/go/#whats-new-in-v3

The below code is having a syntax error:

client.Enqueue(analytics.Track{
  UserId: "f4ca124298",
  Event:  "Signed Up",
  Properties: analytics.NewProperties().
    SetCategory("Enterprise"),
    SetCoupon("synapse"),
    SetDiscount(10),
})

Changed it to:

client.Enqueue(analytics.Track{
  UserId: "f4ca124298",
  Event:  "Signed Up",
  Properties: analytics.NewProperties().
    SetCategory("Enterprise").
    SetCoupon("synapse").
    SetDiscount(10),
})

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