API-EDR section on the Trajectory query needs more text

[chris-little]

The ISO definition that is quoted: trajectory is a path of a moving point described by a one parameter set of points is precisely correct, but not intuitive to understand.

I suggest adding some text along the lines of "In other words, a trajectory is a linear set of points embedded in a 2D, 3D or 4D space. The 3D space may be just space (x,y,z) or space and time (x,y,t)"

Similarly, the Corridor query has a similar hard to understand definition. I suggest adding text along the lines of "Think of a Corridor as a 'thick trajectory' "