internal/history: document Go 1.20.1 and 1.19.6 releases

Change-Id: I1fc72ee3246cb6238fe78843747c982b598ab7c0
Reviewed-on: https://go-review.googlesource.com/c/website/+/468255
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/internal/history/release.go b/internal/history/release.go
index f37f9db..b8c406b 100644
--- a/internal/history/release.go
+++ b/internal/history/release.go
@@ -15,6 +15,26 @@
 // The table is sorted by date, breaking ties with newer versions first.
 var Releases = []*Release{
 	{
+		Date: Date{2023, 2, 14}, Version: Version{1, 20, 1},
+		Security: &FixSummary{
+			Packages: []string{"crypto/tls", "mime/multipart", "net/http", "path/filepath"},
+		},
+		Bug: &FixSummary{
+			Components: []template.HTML{"the compiler", "the <code>go</code> command", "the linker", "the runtime"},
+			Packages:   []string{"time"},
+		},
+	},
+	{
+		Date: Date{2023, 2, 14}, Version: Version{1, 19, 6},
+		Security: &FixSummary{
+			Packages: []string{"crypto/tls", "mime/multipart", "net/http", "path/filepath"},
+		},
+		Bug: &FixSummary{
+			Components: []template.HTML{"the <code>go</code> command", "the linker", "the runtime"},
+			Packages:   []string{"crypto/x509", "net/http", "time"},
+		},
+	},
+	{
 		Date: Date{2023, 2, 1}, Version: Version{1, 20, 0},
 	},
 	{