[web] Remove empty lines in latex scope.

This results in wrong rendering otherwise.

web/content/docs/benchmarks/creepbgra/CreepBRGa.pandoc

@@ -101,7 +101,6 @@ Newton-Raphson is applied to .
  Let $$\begin{gathered}
  \mathbf{r}= { \mathbf \sigma}^{n+1} -
  { \mathbf \sigma}^{n} - \mathbf{C} (\Delta { \mathbf \epsilon} - \alpha_T \Delta T \mathbf I)
-
 + 2bG \Delta t {\left\Vert{\mathbf s}^{n+1}\right\Vert}^{m-1}
  {\mathbf s}^{n+1}
 \end{gathered}$$

web/content/docs/benchmarks/elliptic/elliptic-dirichlet-volumetric-source-term.pandoc

@@ -18,7 +18,6 @@ weight = 102
 We start with Poisson equation:
 $$
 \begin{equation}
-
 - k\; \Delta p = Q \quad \text{in }\Omega
 \end{equation}$$
 w.r.t boundary conditions

web/content/docs/benchmarks/elliptic/poisson_equation.pandoc

@@ -18,7 +18,6 @@ weight = 102
 The Poisson equation is:
 $$
 \begin{equation}
-
 - k\; \Delta p = Q \quad \text{in }\Omega
 \end{equation}$$
 w.r.t boundary conditions

web/content/docs/benchmarks/liquid-flow/primary-variable-constrain-dirichlet-boundary-condition.pandoc

@@ -20,7 +20,6 @@ $$
 \left( c \rho_R + \phi \frac{\partial \rho_R}{\partial p}\right) \frac{\partial
 p}{\partial t} - \nabla \cdot
 \left[ \rho_R \frac{\kappa}{\mu} \left( \nabla p + \rho_R g \right) \right]
-
 - Q_p = 0.
 $$
 where

web/content/docs/benchmarks/python-bc/laplace-equation/python-laplace-eq.pandoc

@@ -33,7 +33,6 @@ We solve Laplace's Equation in 2D on a $1 \times 1$ square domain.
 Laplace's equation is
 $$
 \begin{equation}
-
 - \mathop{\mathrm{div}} (a \mathop{\mathrm{grad}} u) = 0
 \end{equation}
 $$