Fix documented order of transforms for registration.

05_basic_registration.ipynb

@@ -363,7 +363,7 @@
     "</li>\n",
     "</ul>\n",
     "\n",
-    "The transformation that maps points from the fixed to moving image domains is thus: $^M\\mathbf{p}  = T_{opt}(T_m(T_f^{-1}(^F\\mathbf{p})))$\n",
+    "The transformation that maps points from the fixed to moving image domains is thus: $^M\\mathbf{p}  = T_m(T_{opt}(T_f^{-1}(^F\\mathbf{p})))$\n",
     "\n",
     "We now modify the previous example to use $T_{opt}$ and $T_m$."
    ]