Fix mysterious local etcd path documentation

[seantywork]

at contributors/devel/development.md,
in section regarding local etcd installatioin using hack/install-etcd.sh,

export PATH="$GOPATH/src/k8s.io/kubernetes/third_party/etcd:${PATH}"

above line exists.

The problem is that the local etcd installation path is actually

export PATH="$KUBE_ROOT/third_party/etcd:${PATH}"

So I modified that part and added explanation

Which issue(s) this PR fixes:

Fixes #

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This pull-request has been approved by: seantywork
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[ArvindParekh]

(nit)

Suggested change

[seantywork]

thanks,
to be clear, is this just deleting a blank line or related to fmt rule?