lol wiki is right 99% of the time. The 1% contains the things that are simply outdated, since Muramana was never buffed to proc lifesteal, you can assume that the wiki is right.
^this
Adding: Physical damage on-hit effects will benefit from lifesteal unless otherwise specified. Example: Spinning Axe benefits from it but Martial Cadence does not.
Also, lifesteal is not procced by on-hit effects. It IS an on-hit effect. Therefore abilities like Mystic Shot that proc on-hit effects will proc lifesteal.
Adding: Physical damage on-hit effects will benefit from lifesteal unless otherwise specified. Example: Spinning Axe benefits from it but Martial Cadence does not.