internal/gaby: exclude go1.17_spec docs from crawling

This page was temporarily added to help spec revision.
It will be removed at the start of go1.25.
Until then, ignore this page.
(We have two entries for this page in our DB)

For #63

Change-Id: Ibf369100ca25f47ca487bb87f7327388ef8dcef3
Reviewed-on: https://go-review.googlesource.com/c/oscar/+/633395
Reviewed-by: Tatiana Bradley <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: hyangah

internal/gaby/main.go

@@ -782,6 +782,11 @@ var godevDeny = []string{
 	"https://go.dev/s/",
 	"https://go.dev/src/",
 	"https://go.dev/test/",
+
+	// The following pages will be removed at the start of go1.25.
+	// TODO(golang/oscar#63): remove these rules.
+	"https://go.dev/doc/go1.17_spec",
+	"https://go.dev/doc/go1.17_spec.html",
 }
 
 func godevClean(u *url.URL) error {