Add docs

Author: rmosolgo

lib/graphql/schema/argument.rb

@@ -25,6 +25,8 @@ class Argument
       # @param required [Boolean] if true, this argument is non-null; if false, this argument is nullable
       # @param description [String]
       # @param default_value [Object]
+      # @param as [Symbol] Override the keyword name when passed to a method
+      # @param prepare [Symbol] A method to call to tranform this argument's valuebefore sending it to field resolution
       # @param camelize [Boolean] if true, the name will be camelized when building the schema
       def initialize(arg_name, type_expr, desc = nil, required:, description: nil, default_value: NO_DEFAULT, as: nil, camelize: true, prepare: nil, owner:, &definition_block)
         @name = camelize ? Member::BuildType.camelize(arg_name.to_s) : arg_name.to_s