Resolve "Documentation PDF: erreurs à la compilation"

Closes #656 (closed)

docs/en/calculators/structures/cem_88_d.md

@@ -12,7 +12,7 @@ Classical formulation of the free flow weir (\(\mu_F \simeq 0.4\)).
 ## Weir - submerged flow
 (\(h_1 < W\) and \(h_2 \geq \frac{2}{3} h_1\))
 
-\(Q = \mu_S L \sqrt{2g} (h_1-h_2)^{1/2} h_2\)
+$$Q = \mu_S L \sqrt{2g} (h_1-h_2)^{1/2} h_2$$
 
 Classical formulation of the submerged weir.
 
@@ -51,8 +51,7 @@ There are two formulations depending on whether the orifice is partially submerg
 ### Totally submerged flow
 (\(h_1 \geq W\) and \(\frac{2}{3} h_1 + \frac{W}{3} < h_2\))
 
-\(Q = \mu' L \sqrt{2g} (h_1-h_2)^{1/2} \left[ h_2 - (h_2 - W) \right]
-\Rightarrow Q = \mu' L \sqrt{2g} (h_1-h_2)^{1/2} W\)
+$$Q = \mu' L \sqrt{2g} (h_1-h_2)^{1/2} \left[ h_2 - (h_2 - W) \right] \Rightarrow Q = \mu' L \sqrt{2g} (h_1-h_2)^{1/2} W$$
 
 Classical formulation of submerged orifices, with \(\mu' = \mu_S\).