split gisas with specular ref/ex

hugo/content/ex/sim/scatter2d/with-specular.md

++++
+title = "with specular peak"
+weight = 18
++++
+
+## Option: include specular reflection
+
+Only if option [include specular](/ref/sim/setup/otions/specular)
+is set, simulated detector images will include the specular reflection
+of the incident beam.
+
+Example: scattering by dilute boxes on a substrate.
+
+{{< figscg src="/img/auto/scatter2d/BoxesWithSpecularPeak.png" width="500px" class="center" >}}
+
+{{< show-ex file="scatter2d/BoxesWithSpecularPeak.py" >}}

hugo/content/ref/sim/setup/options/specular.md

@@ -11,8 +11,4 @@ along with the scattered intensity in a GISAS simulation, use
 simulation.options().setIncludeSpecular(True)
 ```
 
-Example:
-
-{{< figscg src="/img/auto/scatter2d/BoxesWithSpecularPeak.png" width="500px" class="center" >}}
-
-{{< show-ex file="scatter2d/BoxesWithSpecularPeak.py" >}}
+Example: [GISAS with specular peak](/ex/sim/specular).