minor documentation fix for Shan-Chen

doc/notebooks/07_tutorial_shanchen_twophase.ipynb

@@ -54,11 +54,11 @@
 ## Force & combined velocity
 
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 The force on the fluid is
-$\vec{F}_A(\vec{x})=-\psi(\rho_A(\vec{x}))g_{AA}\sum\limits_{i=1}^{19}w_i\psi(\rho_A(\vec{x}+\vec{c}_i))\vec{c}_i$
+$\vec{F}_A(\vec{x})=-\psi(\rho_A(\vec{x}))g_{AA}\sum\limits_{i=1}^{q}w_i\psi(\rho_A(\vec{x}+\vec{c}_i))\vec{c}_i$
 with 
 $\psi(\rho)=\rho_0\left[1-\exp(-\rho/\rho_0)\right]$.
 
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doc/notebooks/08_tutorial_shanchen_twocomponent.ipynb

@@ -72,11 +72,11 @@
 The force value is not written to a field, but directly evaluated inside the collision kernel.
 
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 The force between the two components is
-$\vec{F}_k(\vec{x})=-\psi(\rho_k(\vec{x}))\sum\limits_{k^\prime\in\{A,B\}}g_{kk^\prime}\sum\limits_{i=1}^{19}w_i\psi(\rho_{k^\prime}(\vec{x}+\vec{c}_i))\vec{c}_i$
+$\vec{F}_k(\vec{x})=-\psi(\rho_k(\vec{x}))\sum\limits_{k^\prime\in\{A,B\}}g_{kk^\prime}\sum\limits_{i=1}^{q}w_i\psi(\rho_{k^\prime}(\vec{x}+\vec{c}_i))\vec{c}_i$
 for $k\in\{A,B\}$
 and with 
 $\psi(\rho)=\rho_0\left[1-\exp(-\rho/\rho_0)\right]$.
 
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