Removed unused error codes (#41567)

Based on [LDM decision for `params` and `dynamic`](https://github.com/dotnet/csharplang/blob/main/meetings/2024/LDM-2024-06-03.md#params-collections-and-dynamic), these four errors codes have been removed, but may be reused in future updates.

So, remove them from our docs so we don't have duplicates when they are added back.

docs/csharp/language-reference/compiler-messages/params-arrays.md

@@ -12,10 +12,6 @@ f1_keywords:
   - "CS1670"
   - "CS1751"
   - "CS9218"
-  - "CS9219"
-  - "CS9220"
-  - "CS9221"
-  - "CS9222"
   - "CS9223"
   - "CS9224"
   - "CS9225"
@@ -32,10 +28,6 @@ helpviewer_keywords:
   - "CS1670"
   - "CS1751"
   - "CS9218"
-  - "CS9219"
-  - "CS9220"
-  - "CS9221"
-  - "CS9222"
   - "CS9223"
   - "CS9224"
   - "CS9225"
@@ -60,19 +52,12 @@ That's by design. The text closely matches the text of the compiler error / warn
 - [**CS1670**](#method-declaration-rules): *`params` is not valid in this context*
 - [**CS1751**](#method-declaration-rules): *Cannot specify a default value for a parameter array.*
 - [**CS9218**](#parameter-and-argument-type-rules): *The type arguments for method cannot be inferred from the usage because an argument with dynamic type is used and the method has a non-array params collection parameter. Try specifying the type arguments explicitly.*
-- [**CS9219**](#parameter-and-argument-type-rules): *Ambiguity between expanded and normal forms of non-array params collection parameter of, the only corresponding argument has the type `dynamic`. Consider casting the dynamic argument.*
 - [**CS9223**](#other-params-errors): *Creation of params collection results in an infinite chain of invocation of constructor.*
 - [**CS9224**](#other-params-errors): *Method cannot be less visible than the member with params collection.*
 - [**CS9225**](#other-params-errors): *Constructor leaves required member uninitialized.*
 - [**CS9227**](#parameter-and-argument-type-rules): *Type does not contain a definition for a suitable instance `Add` method.*
 - [**CS9228**](#parameter-and-argument-type-rules): *Non-array params collection type must have an applicable constructor that can be called with no arguments.*
 
-In addition, the compiler might produce the following *warning* related to the `params` modifier on method parameters:
-
-- [**CS9220**](#parameter-and-argument-type-rules): *One or more overloads of method having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-- [**CS9221**](#parameter-and-argument-type-rules): *One or more indexer overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-- [**CS9222**](#parameter-and-argument-type-rules): *One or more constructor overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-
 ## Method declaration rules
 
 The following errors indicate using a `params` modifier on a parameter when the `params` modifier isn't allowed in that context:
@@ -98,17 +83,10 @@ In versions before C# 12, the `params` modifier can't be used on the parameter o
 The following errors indicate that the type of the parameter used with `params` is invalid:
 
 - **CS9218**: *The type arguments for method cannot be inferred from the usage because an argument with dynamic type is used and the method has a non-array params collection parameter. Try specifying the type arguments explicitly.*
-- **CS9219**: *Ambiguity between expanded and normal forms of non-array params collection parameter of, the only corresponding argument has the type 'dynamic'. Consider casting the dynamic argument.*
 - **CS0225**: *The params parameter must be a single-dimensional array or have a valid collection type*
 - **CS9227**: *Type does not contain a definition for a suitable instance `Add` method.*
 - **CS9228**: *Non-array params collection type must have an applicable constructor that can be called with no arguments.*
 
-The following warnings indicate that the one of the possible overloads might involve dynamic dispatch. The dynamic nature of the argument doesn't participate in overload resolution.
-
-- **CS9220**: *One or more overloads of method having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-- **CS9221**: *One or more indexer overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-- **CS9222**: *One or more constructor overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
-
 In versions before C# 13, the `params` modifier is allowed on single-dimensional arrays only. No other types were valid.
 
 Starting with C# 13 any valid collection type can be used. However, some restrictions remain. The collection type must follow the same rules as the target of a [collection expression](../operators/collection-expressions.md#conversions).

docs/csharp/language-reference/toc.yml

@@ -467,8 +467,7 @@ items:
   - name: Params modifier
     href: ./compiler-messages/params-arrays.md
     displayName: > 
-      CS0225, CS0231, CS0466, CS0674, CS0758, CS1104, CS1611, CS1670, CS1751, CS9218, CS9219, CS9220, CS9221, CS9222, CS9223,
-      CS9224, CS9225, CS9227, CS9228
+      CS0225, CS0231, CS0466, CS0674, CS0758, CS1104, CS1611, CS1670, CS1751, CS9218, CS9223, CS9224, CS9225, CS9227, CS9228
   - name: Nullable warnings
     href: ./compiler-messages/nullable-warnings.md
     displayName: >