Trim access-review connector comments

Cut verbose inline comments across the access-review connector changes:
the mechanical fact stays at the read site, while incident backstory
("millions of error logs in prod") and provider-specific rationale (why
Clerk reviews the wrong population) move to the commit history where they
belong. Also tighten a loose "a 4xx" to "an auth/not-found 4xx" so the
terminal-classification contract is not overstated. No behavior change.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/tailscale.go

@@ -151,9 +151,9 @@ func (d *TailscaleDriver) fetchUsers(ctx context.Context) ([]tailscaleUser, erro
 	}()
 
 	// Classify the status so the source-name worker (which reuses this via
-	// tailscaleNameResolver) treats a 4xx as terminal instead of hot-looping.
-	// The sentinel is inert on the ListAccounts sync path, which does not
-	// inspect it.
+	// tailscaleNameResolver) treats an auth/not-found 4xx as terminal instead
+	// of hot-looping. The sentinel is inert on the ListAccounts sync path,
+	// which does not inspect it.
 	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
 		return nil, nameStatusError("tailscale users", httpResp.StatusCode)
 	}