_content/blog/vuln: provide installation details for govulncheck

Fixes golang/go#57412

Change-Id: Id679631712b177c82f2ff2c15d141204e5ce47c5
Reviewed-on: https://go-review.googlesource.com/c/website/+/459255
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>

_content/blog/vuln.md

@@ -53,9 +53,15 @@ affect their projects.
 Govulncheck analyzes your codebase and only surfaces vulnerabilities that
 actually affect you,
 based on which functions in your code are transitively calling vulnerable functions.
-To start using govulncheck, you can run the following from your project:
+
+You can install the latest version of govulncheck using
+[go install](https://pkg.go.dev/cmd/go#hdr-Compile_and_install_packages_and_dependencies):
 ```
 $ go install golang.org/x/vuln/cmd/govulncheck@latest
+```
+
+Then, run govulncheck inside your project directory:
+```
 $ govulncheck ./...
 ```