[GUI] Better module descriptions #18868
Merged
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The improvements are as follows:
Added advice to the composite module description on how to avoid banding. The wording is basically from @ralfbrown (see Composite cauases posterization in shadows #18573 (comment)), but I've shortened it to just mention of banding. To my mind, what "completely independent development" means will not be very clear to newbies who read the module tooltip, it would be better to explain this in the manual.
Also slightly improved the wording of the composite module description, which was grammatically sloppy and ambiguous due to missing noun (what exactly do we "combine with elements"?).
Rebalanced line lengths in the "diffuse or sharpen" module, reducing the length of the longest line to reduce the overall width of the tooltip.