Using the legacy image effects, clicking the help icon in Unity 2017.1 in the inspector takes us to invalid webpages on the Unity site:
Examples:
Noise and Grain: https://docs.unity3d.com/Manual/script-NoiseAndGrain.html
Antialiasing: https://docs.unity3d.com/Manual/script-Antialiasing.html
I think these image effects are still valid, since the new PostProcessing stack is technically still in beta.