Fix optional flag in dosctring

Author: miguelmarco

src/sage/schemes/curves/projective_curve.py

@@ -1697,7 +1697,7 @@ def fundamental_group(self):
             sage: P.<x,y,z>=ProjectiveSpace(QQ,2)
             sage: f=z^2*y^3-z*(33*x*z+2*x^2+8*z^2)*y^2+(21*z^2+21*x*z-x^2)*(z^2+11*x*z-x^2)*y+(x-18*z)*(z^2+11*x*z-x^2)^2
             sage: C = P.curve(f)
-            sage: C.fundamental_group()
+            sage: C.fundamental_group() # optional - sirocco
             Finitely presented group < x1, x3 | (x3^-1*x1^-1*x3*x1^-1)^2*x3^-1, x3*(x1^-1*x3^-1)^2*x1^-1*(x3*x1)^2 >
 
         """