VCD tracing docs patch

[Philip Conrad]

Hello simulavr folks,

Thanks for making simulavr! I recently started using simulavr for a 
university project, and wound up generating VCD files from simulavr to 
view later in Gtkwaves. I was amazed at the level of detail I could get 
in my traces.

However, it took some effort for me to dig up how to do VCD traces in 
simulavr, and the man pages didn't have any examples I could find for 
how to create VCD traces. Ultimately, I had to search through the 
mailing lists to find the command-line incantations I needed.

I have written up a possible docs patch (attached in Git patch format) 
which might provide useful examples/info for future folks looking to do 
VCD traces. It may have issues (formatting especially), so please let me 
know if there's anything I could do to make the patch better.

Thank you!
-Philip Conrad

docs_vcd.patch
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