The 2001-02 television season ends tonight and NBC, buoyed by a resurgent Friends (the No. 1 show) as well as enduring hits ER (No. 3) and Law & Order (No. 5), will be crowned the No. 1 network. CBS will finish a strong second, thanks in large part to CSI (No. 2) and Everybody Loves Raymond (No. 5). The news was bad for the No. 3 network, ABC, which saw a quarter of its audience slip away. Fox, meanwhile, was No. 4 (down 4 percent), followed by UPN (up 15 percent) and the WB (up 1 percent).