Documentation Updates

[ikeough]

• [x] Point light is too bright.
• [x] Spot light is too bright.
• [x] GridLine needs an example.
• [x] Joist example is blank.
• [x] Material needs an example.
• [x] ModelText example is really small.
• [ ] Opening needs an example (maybe wait until after #531)
• [x] StandardWall openings are in the wrong place in the example.
• [ ] ParametricProfile could use an example (@ikeough)
• [ ] AdaptiveGrid needs an example (@wynged)
• [x] ModelLines example is broken.
• [ ] ContentElement needs an example (@wynged)
• [ ] ContentCatalog needs an example (@wynged)

[ikeough]

Partially fixed in #773. Awaiting more doc updates.