Convert tracing.txt to rST and add it to the generated developer documentation.

Peter Maydell suggested making the "log" backend the recommended backend in the
quickstart documentation. It's easier to use than the "simple" backend. The
final patch updates the documentation to do this.

Stefan Hajnoczi (3):
  trace: fix simpletrace doc mismerge
  tracing: convert documentation to rST
  trace: recommend "log" backend for getting started with tracing

 docs/devel/index.rst                    |   1 +
 docs/devel/{tracing.txt => tracing.rst} | 175 ++++++++++++++----------
 2 files changed, 100 insertions(+), 76 deletions(-)
 rename docs/devel/{tracing.txt => tracing.rst} (86%)

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2.28.0