internal/socks: fix typo in comment
internal/socks: fix typo in comment

Follow-up fix for CL 115237 which fixed the generated file.

Change-Id: I17881ce4ad1fc8f7d74b2b78e515d5d5430ad451
Reviewed-on: https://go-review.googlesource.com/115275
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/net