Extra typos found by Ben (#41)

* Changes to the frontal_ablation notebook

Hello,
I added Ben's suggestions and also did some editions to the text. 

Let me know if you agree

* Add files via upload

* Extra typos that Ben found

* solving conflicts

notebooks/oggm-tuto/inversion_with_frontal_ablation.ipynb

@@ -192,7 +192,7 @@
     "We don't know which is the **real** value of the calving flux at this glacier. From here, let's make some very coarse assumptions:\n",
     "- the Oerlemans and Nick calving law is perfectly exact\n",
     "- the tuning parameter $k$ is known\n",
-    "- our glacier is in equilibrium (a fundamental assumption for mass-conservation inversion)\n",
+    "- our glacier is in equilibrium (a fundamental assumption necessary for mass-conservation inversion)\n",
     "- ice deformation at the glacier terminus follows Glen's flow law\n",
     "\n",
     "Under these assumptions, we are now going to show, that there is **one and only one** value for the frontal thickness which complies with *both* the calving law and the ice thickness inversion model of OGGM.\n",
@@ -256,7 +256,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We already know that the calving law relates the thickness to the flux with a root of degree two (blue curve). Now, what explains the shape of **the orange curve** (OR BLUE??)? It is Glen's flow law, which relates ice thickness to the flux with a 5th degree root (assuming n=3). This is the reason why there is one (and only one) non-zero solution to the problem of finding a calving flux which is compatible with both the calving law and the physics of ice deformation (under our simplified framework of course).\n",
+    "We already know that the calving law relates the thickness to the flux with a root of degree two (blue curve). Now, what explains the shape of **the orange curve**?. It is Glen's flow law, which relates ice thickness to the flux with a 5th degree root (assuming n=3). This is the reason why there is one (and only one) non-zero solution to the problem of finding a calving flux which is compatible with both the calving law and the physics of ice deformation (under our simplified framework of course).\n",
+
     "\n",
     "Note that adding sliding doesn't change the problem (we still solve a polynome of degree 5 in OGGM, [with a new term in degree 3](https://docs.oggm.org/en/latest/ice-dynamics.html)):"
    ]
@@ -426,9 +427,8 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": [
-    "If this happens during the iteration, OGGM is going to set $\\mu^*$ to zero and computes the corresponding flux (the maximal physically possible value). In this case, the calving law and OGGM disagree:"
-   ]
+   "source": ["If this happens during the iteration, OGGM is going to set $\\mu^*$ to zero and computes the corresponding flux (the maximal physically possible value). In this case, the calving law and OGGM disagree:"
+ ]
   },
   {
    "cell_type": "code",