vulncheck: update doc with simple wording change
vulncheck: update doc with simple wording change

Change-Id: Icb389872b54cf10799ed574e095ed57942fb7188
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/428014
Reviewed-by: Julie Qiu <e6cb64861edcc38971590ff27c111e0e672de045@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>
Run-TryBot: Zvonimir Pavlinovic <490af24f3def1258d2f7e9b10b20e341f6c68320@google.com>

golang/vuln,golang/vuln