More deprecations of set docs stuff

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diff --git a/docs/sets.md b/docs/sets.md
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-# Sets
-
-Sets represent an unordered collection of unique elements. These are
-implemented using hash tables.
-
-```tomo
-a := |10, 20, 30|
-b := |20, 30|
->> a.overlap(b)
-= |20|
-```
-
-## Syntax
-
-Sets are written using `|...|` vertical pipes with comma-separated items:
-
-```tomo
-nums := |10, 20, 30|
-```
-
-Empty sets must specify the set type explicitly:
-
-```tomo
-empty : |Int| = ||
-```
-
-For type annotations, a set that holds items with type `T` is written as `|T|`.
-
-### Comprehensions
-
-Similar to lists, sets can use comprehensions:
-
-```tomo
-set := |10*i for i in 10|
-set2 := |10*i for i in 10 if i mod 2 == 0|
-set3 := |-10, 10*i for i in 10|
-```
-
-## Accessing Items
-
-Sets internally store their items in a list, which you can access with the
-`.items` field. This is a constant-time operation that produces an immutable
-view:
-
-```tomo
-set := |10, 20, 30|
->> set.items
-= [10, 20, 30]
-```
-
-## Length
-
-Set length can be accessed by the `.length` field:
-
-```tomo
->> |10, 20, 30|.length
-= 3
-```
-
-## Iteration
-
-You can iterate over the items in a table like this:
-
-```tomo
-for item in set
-    ...
-
-for i, item in set
-    ...
-```
-
-Set iteration operates over the value of the set when the loop began, so
-modifying the set during iteration is safe and will not result in the loop
-iterating over any of the new values.
-
-# API
-
-[API documentation](../api/sets.md)