fixed cdot (dot is above next token)

Signed-off-by: Nick Papior <[email protected]>

src/sisl/_core/geometry.py

@@ -1711,9 +1711,9 @@ def dihedral(
             \mathbf u_2 &= \mathbf r_3 - \mathbf r_2
             \\
             \phi &= \operatorname{atan2}\Big(
-                 \hat{\mathbf u}_0\dot
+                 \hat{\mathbf u}_0\cdot
                 (\hat{\mathbf u}_1\times\hat{\mathbf u}_2),
-                (\hat{\mathbf u}_0\times\hat{\mathbf u}_1)\dot
+                (\hat{\mathbf u}_0\times\hat{\mathbf u}_1)\cdot
                 (\hat{\mathbf u}_1\times\hat{\mathbf u}_2)
                 \Big)