Make PERK2 constructor consistent

NEWS.md

@@ -4,14 +4,6 @@ Trixi.jl follows the interpretation of [semantic versioning (semver)](https://ju
 used in the Julia ecosystem. Notable changes will be documented in this file
 for human readability.
 
-## Changes when updating to v0.10 from v0.9.x
-
-#### Changed
-
-- The `PairedExplicitRK2` constructor with second argument `base_path_monomial_coeffs::AbstractString` requires 
-  now `dt_opt`, `b1`, `cS` to be given as keyword arguments ([#2184]).
-  Previously, those where standard function parameters, in the same order as listed above.
-
 ## Changes in the v0.9 lifecycle
 
 #### Added

src/time_integration/paired_explicit_runge_kutta/methods_PERK2.jl

@@ -98,7 +98,7 @@ function compute_PairedExplicitRK2_butcher_tableau(num_stages,
 end
 
 @doc raw"""
-    PairedExplicitRK2(num_stages, base_path_monomial_coeffs::AbstractString; dt_opt = nothing,
+    PairedExplicitRK2(num_stages, base_path_monomial_coeffs::AbstractString, dt_opt = nothing,
                       bS = 1.0, cS = 0.5)
     PairedExplicitRK2(num_stages, tspan, semi::AbstractSemidiscretization;
                       verbose = false, bS = 1.0, cS = 0.5)
@@ -143,7 +143,7 @@ mutable struct PairedExplicitRK2 <: AbstractPairedExplicitRKSingle
 end # struct PairedExplicitRK2
 
 # Constructor that reads the coefficients from a file
-function PairedExplicitRK2(num_stages, base_path_monomial_coeffs::AbstractString;
+function PairedExplicitRK2(num_stages, base_path_monomial_coeffs::AbstractString,
                            dt_opt = nothing,
                            bS = 1.0, cS = 0.5)
     # If the user has the monomial coefficients, they also must have the optimal time step