Update doc/sphinx/user_manual/basic_starter_tutorial/08_passive_margi…

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doc/sphinx/user_manual/basic_starter_tutorial/08_passive_margin_variable_depth.md

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 Adding a passive margin with variable depth
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-Although we have hinted towards it before, there is also an [area feature](part:user_manual:chap:concepts:sec:area_features) called `continental plate`. It works as you would expect based on what you have seen with the oceanic plate. Here we are going to use it to do something very cool in our model - specify a feature with variable depths and layers within a given feature!
+Although we have hinted towards it before, there is also an [area feature](part:user_manual:chap:concepts:sec:area_features) called `continental plate`. It works as you would expect based on what you have seen with the oceanic plate. Here we are going to use it to do something very cool in our model - specify a feature with variable depths for the whole feature and also layers within the given feature!
 
 To showcase this, we will be adding a passive margin to our model at the overriding plate side of our model. To start out, we need to know that both the `min depth` and `max depth` accept two types of values: a number and an array of values at points.