embed: fix variable name in example
Use variable 'mux' for an http.ServeMux, not 'mutex'.
Change-Id: I58e9a8ebacbb61727ec4b8e4d0fd7f73e86ab381
Reviewed-on: https://go-review.googlesource.com/c/go/+/539515
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: qiulaidongfeng <
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Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Emmanuel Odeke <emmanuel@orijtech.com>