internal/history: document Go 1.17.8 and Go 1.16.15

Change-Id: I11c6c82488fb2b17c4b444eca5b85aeaa439b7fc
Reviewed-on: https://go-review.googlesource.com/c/website/+/389735
Reviewed-by: Alex Rakoczy <alex@golang.org>
Trust: Alex Rakoczy <alex@golang.org>
Run-TryBot: Alex Rakoczy <alex@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Carlos Amedee <amedee@google.com>

internal/history/release.go

@@ -14,6 +14,16 @@ import "golang.org/x/website/internal/backport/html/template"
 //
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
+	{
+		Date: Date{2022, 3, 3}, Version: Version{1, 17, 8},
+		CustomSummary: `includes a security fix to the <code>regexp/syntax</code> package, as well as bug fixes to the compiler, runtime, the <code>go</code> command, and the <code>crypto/x509</code>, and <code>net</code> packages.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.17.8+label%3ACherryPickApproved">Go 1.17.8 milestone</a> on our issue tracker for details.`,
+	},
+	{
+		Date: Date{2022, 3, 3}, Version: Version{1, 16, 15},
+		CustomSummary: `includes a security fix to the <code>regexp/syntax</code> package, as well as bug fixes to the compiler, runtime, the <code>go</code> command, and to the <code>net</code> package.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.16.15+label%3ACherryPickApproved">Go 1.16.15 milestone</a> on our issue tracker for details.`,
+	},
 	{
 		Date: Date{2022, 2, 10}, Version: Version{1, 17, 7},
 		CustomSummary: `includes security fixes to the <code>crypto/elliptic</code>, <code>math/big</code> packages and to the <code>go</code> command, as well as bug fixes to the compiler, linker, runtime, the <code>go</code> command, and the <code>debug/macho</code>, <code>debug/pe</code>, and <code>net/http/httptest</code> packages.