fixes doctests for katsura

Author: ederc

src/examples/katsura.jl

@@ -25,10 +25,7 @@ Also note that indices have been shifted to start from 1.
 julia> using AlgebraicSolving
 
 julia> katsura(2)
-3-element Vector{Nemo.fmpq_mpoly}:
- x1 + 2*x2 + 2*x3 - 1
- x1^2 + 2*x2^2 + 2*x3^2 - x1
- 2*x1*x2 + 2*x2*x3 - x2
+Nemo.fmpq_mpoly[x1 + 2*x2 + 2*x3 - 1, x1^2 + 2*x2^2 + 2*x3^2 - x1, 2*x1*x2 + 2*x2*x3 - x2]
 ```
 """
 function katsura(log_solutions::Int, characteristic::Int=0)
@@ -56,11 +53,7 @@ julia> R, _ = QQ["x", "y", "z"]
 (Multivariate Polynomial Ring in x, y, z over Rational Field, Nemo.fmpq_mpoly[x, y, z])
 
 julia> katsura(R)
-3-element Vector{Nemo.fmpq_mpoly}:
- x + 2*y + 2*z - 1
- x^2 - x + 2*y^2 + 2*z^2
- 2*x*y + 2*y*z - y
-
+Nemo.fmpq_mpoly[x + 2*y + 2*z - 1, x^2 - x + 2*y^2 + 2*z^2, 2*x*y + 2*y*z - y]
 ```
 """
 function katsura(R::MPolyRing)