Fix 32-bit test failure

Author: jdemeyer

cypari2/gen.pyx

@@ -4802,7 +4802,7 @@ cdef class Gen(Gen_auto):
             den = [&=...] INT(lg=3):... (+,lgefint=3):...
           2nd component = [&=...] COMPLEX(lg=3):...
             real = [&=...] INT(lg=3):... (+,lgefint=3):...
-            imag = [&=...] REAL(lg=3):... (+,expo=0):...
+            imag = [&=...] REAL(lg=...):... (+,expo=0):...
         """
         sig_on()
         dbgGEN(self.g, depth)