Apparently the Real work allocation GUI was changed a little, but the help file still shows the old details:

Page: RealWorkAllocation.html

Under the topic-
2 - Show planned work

The second bullet point states that-
"Planned work is indicated over each input cell, on top right corner, in light blue color."

It should be corrected in 4 places, as shown below-
"Planned work is indicated IN each input cell, IN top LEFT corner, in light GRAY color."

(Allcaps and bolding done just to highlight the changes needed.)

The following image also needs to be updated.
ZONE_RealWorkAllocationWithPlannedWork.png

Further down, the note (in dark gray box) says:
The planned work will be deleted when the real work is entered (to avoid duplication of work in reports).

But the actual GUI continues to show the planned work hours even after we enter the actual work.
So probably this note needs to be rephrased.