Replace "π" with "pi"

Co-authored-by: Luke Helt <[email protected]>

Author: tomdodd4598

thewalrus/decompositions.py

@@ -230,7 +230,7 @@ def takagi(A, svd_order=True, rtol=1e-16):
     # Rotate z to shift midpoint of largest arc to ±pi
     shift_angle = np.ones(n) * shift_angle
     z @= np.diag(np.exp(1j * shift_angle))
-    # Undo rotation from ±π
+    # Undo rotation from ±pi
     U = u @ sqrtm(z) @ np.diag(np.exp(-0.5j * shift_angle))
     if svd_order is False:
         return d[::-1], U[:, ::-1]