copilot-instructions: remove F# initializers section

FSharpLint already has a (dogfood) way of checking if this
approach is being respected: the rule FL0084, called
FavourNonMutablePropertyInitialization.

Author: knocte

.github/copilot-instructions.md

@@ -23,35 +23,3 @@ type DerivedClass =
     [<DefaultValue>]
     val mutable otherField : FieldType
 ```
-
-Always prefer F# class initializers over property assignment! **You absolutely must use F# class initializers instead of property assignment**!
-
-Class declaration:
-``` F#
-type MyClass (someConstructorParam : string) =
-    member ReadOnlyProperty = someConstructorParam
-
-    member val MutableProperty1 = "" with get, set
-    member val MutableProperty2 = "" with get, set
-```
-
-Wrong:
-``` F#
-let myClass = MyClass("some value")
-myClass.MutableProperty1 <- "new value"
-myClass.MutableProperty2 <- "new value"
-```
-
-Right:
-``` F#
-let myClass =
-    MyClass(
-        // constructor parameters go first without names
-        "some value",
-        // then mutable properties go next with names
-        MutableProperty1 = "new value",
-        MutableProperty2 =
-            // operations must be placed into parentheses
-            (5 |> string)
-    )
-```