Add documentation on signal aspects

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-% advtrains.speed.set_restriction(3advtrains) | Advtrains Developer's Manual
-
-# NAME
-`advtrains.speed.set_restriction`, `advtrains.speed.merge_aspect` - modify speed restriction
-
-# SYNOPSIS
-* `advtrains.speed.set_restriction(train, rtype, rval)`
-* `advtrains.speed.merge_aspect(train, asp)`
-
-# DESCRIPTION
-
-The `advtrains.speed.set_restriction` function sets the speed restriction of type `rtype` of `train` to `rval` and updates the speed restriction value to the strictest speed restriction in the table, or `nil` if all speed restrictions are `nil` or `-1`. If the speed restriction table does not exist, it is created with the `"main"` speed restriction being the speed restriction value of `train`.
-
-The `advtrains.speed.merge_aspect` function merges the main aspect of `asp` into the speed restriction table with the same procedure described above. If the signal aspect table does not provide the type of speed restriction, the restriction type `"main"` is assumed.
-
-# SIDE EFFECTS
-
-Both functions modify `train.speed_restriction` and `train.speed_restrictions_t`.