message: Fix typo in features doc
diff: @@ -292,7 +292,7 @@ enabled. Some options to try:
  * `cargo tree -e features`: This will show features in the dependency graph.
  Each feature will appear showing which package enabled it.
  * `cargo tree -f "{p} {f}"`: This is a more compact view that shows a
  - comma-spearated list of features enabled on each package.
  + comma-separated list of features enabled on each package.
  * `cargo tree -e features -i foo`: This will invert the tree, showing how
  features flow into the given package "foo". This can be useful because
  viewing the entire graph can be quite large and overwhelming. Use this when
  