sagemathgh-41006: sage.rings.polynomial.multi_polynomial_libsingular: add one "needs"
    
A coercion test for `BooleanPolynomialRing` requires polybori/brial. We
already have a "feature" for this; it's just missing the "needs" bit.
    
URL: sagemath#41006
Reported by: Michael Orlitzky
Reviewer(s): Frédéric Chapoton

Author: Release Manager

src/sage/rings/polynomial/multi_polynomial_libsingular.pyx

@@ -663,6 +663,7 @@ cdef class MPolynomialRing_libsingular(MPolynomialRing_base):
 
         Coercion from boolean polynomials, also by index::
 
+            sage: # needs sage.rings.polynomial.pbori
             sage: B.<x,y,z> = BooleanPolynomialRing(3)
             sage: P.<x,y,z> = QQ[]
             sage: P(B.gen(0))