Revert "Add a section about constants in patterns"

This reverts commit ed27885391b4ed686dc615872fbff77f8122a358.

roc-for-elm-programmers.md

@@ -377,43 +377,18 @@ when color is
     Green | Red | Yellow -> 4 # only gets run if totalColors < 3
 ```
 
-This gives you a way to use local variables in patterns:
+This gives you a way to use constants in patterns:
 
 ```rust
-\min, max ->
-    when number is
-        0 -> "zero"
-        1 -> "one"
-        v if v == min -> "min"
-        v if v == max -> "max"
-        _ -> "other"
-```
-
-You can also use constants in pattern matches by fully-qualifying them:
-
-```rust
-when number is
-    0 -> "zero"
-    1 -> "one"
-    Num.pi -> "pi"
-    _ -> "other"
-```
-
-In Roc, you can also write `Foo.bar` inside the `Foo` module itself (and it even works for
-unexposed things in the current module), which gives you a way to refer to top-level constants
-in the same module.
-
-So so the following code would work as expected, assuming it's written at the top level of
-a module named `Foo`:
-
-```rust
-constant = 42
+pi = 3.14
+e = 2.72
 
 when number is
     0 -> "zero"
     1 -> "one"
-    Foo.constant -> "constant"
-    _ -> "other"
+    v if v == pi -> "pi"
+    v if v == e -> "e"
+    _ -> ""
 ```
 
 ## Custom Types