_content/doc: update multiple go install instructions

In 1.17 users are presented with a deprecation warning when using
go get like this. Now go install is more appropriate.

Fixes golang/go#47939
Updates golang/go#43684

Change-Id: Ia5530cfd432d216029b6618d55488de89eaff835
Reviewed-on: https://go-review.googlesource.com/c/website/+/347211
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Website-Publish: DO NOT USE <dmitshur@google.com>
Trust: Cody Oss <codyoss@google.com>
diff --git a/_content/doc/manage-install.html b/_content/doc/manage-install.html
index 06d5631..95d36a1 100644
--- a/_content/doc/manage-install.html
+++ b/_content/doc/manage-install.html
@@ -23,11 +23,11 @@
 </p>
 
 <p>
-To install additional Go versions, run the <a href="/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them"><code>go get</code> command</a>, specifying the download location of the version you want to install. The following example illustrates with version 1.10.7:
+To install additional Go versions, run the <a href="/cmd/go/#hdr-Compile_and_install_packages_and_dependencies"><code>go install</code> command</a>, specifying the download location of the version you want to install. The following example illustrates with version 1.10.7:
 </p>
 
 <pre>
-$ go get golang.org/dl/go1.10.7
+$ go install golang.org/dl/go1.10.7@latest
 $ go1.10.7 download
 </pre>