some more text for brain stim modules

Author: jessdtate

docs/modules/BrainStimulator/ModelTMSCoil.md

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+# ModelTMSCoil
+
+Generate a TMS coil geometry with current sources to model include in TMS modeling pipeline.  
+
+**Detailed Description**
+
+The ModelTMSCoil module will use a set of parameters from the module UI (or module state) to generate mesh with field data to represent a TMS stimulation device in a TMS modeling pipeline.  This module is designed to work with the [SolveBioSavart](SolveBioSavart.md) module where the current sources of the coil will be used to estimate the magnetic field through a target domain.  
+
+See the [Brain Stimulator Toolkit](https://github.com/SCIInstitute/BrainStimulator) and its [Manual](https://github.com/SCIInstitute/BrainStimulator/blob/master/Documentation/Manuals/BrainStimulatorTutorial.pdf) for more information.  
+
+Module parameters used to generate the TMS coil geometry and field data are:
+ - 
+
+Inputs to the module are:
+ - Coil (Field type): a TMS coil field, assumed to match the format of the [ModelTMSCoil](ModelTMSCoil.md) module output.  
+ - Mesh [Field type]: head or domain mesh for the magnetic field prediction
+
+Outputs are only generated when ports are connected.  These are:
+ - VectorBField (Matrix type): Matrix containing the **magnetic field** values for each point on the domain mesh.  Use [SetFieldData](../ChangeFieldData/SetFieldData.md) to reassign these values to the mesh 
+ - VectorAField (Matrix type): Matrix containing the **magnetic vector potential** values for each point on the domain mesh.  Use [SetFieldData](../ChangeFieldData/SetFieldData.md) to reassign these values to the mesh. 

docs/modules/BrainStimulator/SolveBioSavart.md

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+# SolveBioSavart
+
+Calculation of magnetic field through a given domain mesh with a TMS coil geometry.  
+
+**Detailed Description**
+
+The modules calculates the magnetic field due to given TMS coil geometry and parameters at through a provide domain mesh based on the Biot-Savart law.
+
+See the [Brain Stimulator Toolkit](https://github.com/SCIInstitute/BrainStimulator) and its [Manual](https://github.com/SCIInstitute/BrainStimulator/blob/master/Documentation/Manuals/BrainStimulatorTutorial.pdf) for more information.  
+
+Inputs to the module are:
+ - Coil (Field type): a TMS coil field, assumed to match the format of the [ModelTMSCoil](ModelTMSCoil.md) module output.  
+ - Mesh [Field type]: head or domain mesh for the magnetic field prediction
+
+Outputs are only generated when ports are connected.  These are:
+ - VectorBField (Matrix type): Matrix containing the **magnetic field** values for each point on the domain mesh.  Use [SetFieldData](../ChangeFieldData/SetFieldData.md) to reassign these values to the mesh 
+ - VectorAField (Matrix type): Matrix containing the **magnetic vector potential** values for each point on the domain mesh.  Use [SetFieldData](../ChangeFieldData/SetFieldData.md) to reassign these values to the mesh.