message: Fix 'ploting_backend' -> 'plotting_backend' typo in the manual.
diff: @@ -24,7 +24,7 @@ output_format = "criterion"
  # This is used to configure the plotting backend used by cargo-criterion.
  # Options are "gnuplot" and "plotters", or "auto", which will use gnuplot if it's
  # available or plotters if it isn't.
  -ploting_backend = "auto"
  +plotting_backend = "auto"
  # The colors table allows users to configure the colors used by the charts
  # cargo-criterion generates.
  