make vectorization docs point to the right functions

meanas/fdfd/operators.py

@@ -3,7 +3,7 @@ Sparse matrix operators for use with electromagnetic wave equations.
 
 These functions return sparse-matrix (`scipy.sparse.spmatrix`) representations of
  a variety of operators, intended for use with E and H fields vectorized using the
- `meanas.vec()` and `meanas.unvec()` functions.
+ `meanas.fdmath.vectorization.vec()` and `meanas.fdmath.vectorization.unvec()` functions.
 
 E- and H-field values are defined on a Yee cell; `epsilon` values should be calculated for
  cells centered at each E component (`mu` at each H component).

meanas/fdfd/solvers.py

@@ -74,7 +74,7 @@ def generic(omega: complex,
     """
     Conjugate gradient FDFD solver using CSR sparse matrices.
 
-    All ndarray arguments should be 1D arrays, as returned by `meanas.vec()`.
+    All ndarray arguments should be 1D arrays, as returned by `meanas.fdmath.vectorization.vec()`.
 
     Args:
         omega: Complex frequency to solve at.