TSpline Nodes Documentation - First set

doc/distrib/NodeHelpFiles/3W2XHZKQEZFB7P3OTUVOZUMCD3M7PKUFQZI42URWMPFARFIN2NVQ.md

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 <!--- Autodesk.DesignScript.Geometry.TSpline.TSplineSurface.BySphereCenterPointRadius --->
 <!--- 3W2XHZKQEZFB7P3OTUVOZUMCD3M7PKUFQZI42URWMPFARFIN2NVQ --->
-## BySphereCenterPointRadius - Documentation
-This documentation file is auto generated by NodeDocumentationMarkdownGenerator, Version=2.14.0.3986, Culture=neutral, PublicKeyToken=null.
+## In-Depth
+In the example below, a T-Spline sphere primitive surface is created using the `TSplineSurface.BySphereCenterPointRadius` node. The `centerPoint` input defines the origin of the sphere and the `radius` specifies its size. `radiusSpans` and `heightSpans` inputs control the number of faces along the height and radial spans (or meridians). The `symmetry` controls if the shape has initial symmetry and, finally, `inSmoothMode` defines if the preview is in smooth or box mode.
 
-For more information about adding documentation to nodes see https://github.com/DynamoDS/Dynamo/wiki/Create-and-Add-Custom-Documentation-to-Nodes
+## Example File
 
+![Example](./Autodesk.DesignScript.Geometry.TSpline.TSplineSurface.BySphereCenterPointRadius_img.jpg)

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 <!--- Autodesk.DesignScript.Geometry.TSpline.TSplineSurface.ByCylinderPointsRadius --->
 <!--- AUSALFCUDD62GV5ALRNIDJ43LBF3FWW5HY5WNAQBKRB7E2JF7WUQ --->
-## ByCylinderPointsRadius - Documentation
-This documentation file is auto generated by NodeDocumentationMarkdownGenerator, Version=2.14.0.3986, Culture=neutral, PublicKeyToken=null.
+## In-Depth
+In the example below, a T-Spline primitive cylinder surface is created. The bottom and top planes of the cylinder are defined by `startPoint` and `endPoint` inputs and the size is set by the `radius` input value. The spans in radial and height directions are controlled by `radiusSpans` and `heightSpans` inputs. The initial symmetry of the shape is specified by the `symmetry` input. If X or Y symmetry is set to True, the value of radial spans must be a multiple of 4. Finally, the `inSmoothMode` input is used to switch between smooth and box mode preview of the T-Spline surface.
 
-For more information about adding documentation to nodes see https://github.com/DynamoDS/Dynamo/wiki/Create-and-Add-Custom-Documentation-to-Nodes
+## Example File
 
+![Example](./Autodesk.DesignScript.Geometry.TSpline.TSplineSurface.ByCylinderPointsRadius_img.jpg)