Adding a title to the note

Author: erikvansebille

docs/examples/tutorial_parcels_structure.ipynb

@@ -324,8 +324,9 @@
     "  - Note that one has to be careful with writing kernels for vector fields on Curvilinear grids. While Parcels automatically rotates the U and V field when necessary, this is not the case for for example wind data. In that case, a custom rotation function will have to be written.\n",
     "\n",
     "  <div class=\"alert alert-info\">\n",
+    "  A note on Field interpoaltion notation\n",
     "\n",
-    "    Note that for the interpolation of a `Field`, the second option (`value = fieldset.U[particle]`) is not only a short-hand notation for the (`value = fieldset.U[time, particle.depth, particle.lat, particle.lon]`); it is actually a _faster_ way to interpolate the field at the particle location in Scipy mode, as described in [this section of the JIT-vs-Scipy tutorial](https://docs.oceanparcels.org/en/latest/examples/tutorial_jit_vs_scipy.html#Further-digging-into-Scipy-mode:-adding-particle-keyword-to-Field-sampling).\n",
+    "  Note that for the interpolation of a `Field`, the second option (`value = fieldset.U[particle]`) is not only a short-hand notation for the (`value = fieldset.U[time, particle.depth, particle.lat, particle.lon]`); it is actually a _faster_ way to interpolate the field at the particle location in Scipy mode, as described in [this section of the JIT-vs-Scipy tutorial](https://docs.oceanparcels.org/en/latest/examples/tutorial_jit_vs_scipy.html#Further-digging-into-Scipy-mode:-adding-particle-keyword-to-Field-sampling).\n",
     "  \n",
     "  </div>"
    ]