[FIX] fslwiki is redirecting to fsl/docs

src/modality-specific-files/magnetic-resonance-imaging-data.md

@@ -721,7 +721,7 @@ within the `[*_]dwi.bval` and `[*_]dwi.bvec` files) MAY change across DWI runs.
 
 **Gradient orientation file formats**.
 The `[*_]dwi.bval` and `[*_]dwi.bvec` files MUST follow the
-[FSL format](https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FDT/UserGuide#DTIFIT):
+[FSL format](https://fsl.fmrib.ox.ac.uk/fsl/docs/#/diffusion/index?id=diffusion-data-in-fsl):
 The `[*_]dwi.bvec` file contains 3 rows with *N* space-delimited floating-point numbers
 (corresponding to the *N* volumes in the corresponding NIfTI file.)
 The first row contains the *x* elements, the second row contains the *y* elements and