Update README.md

Co-authored-by: T. Wouters <[email protected]>

Author: mdboom

README.md

@@ -171,7 +171,7 @@ In `bench_runner.toml`, the `flag_effect_plot` table has a `subplots` key which
 - `name`: The description of the flags to use in the title.
 - `head_flags`: A list of flags to use as the head.
 - `base_flags`: (optional) A list of flags to use as the base. By default, this is a default build, i.e. no flags.
-- `runner_map`: (optional) If you need to map a runner to a base in a different runner, you can provide that mapping here. For example, with tail-calling, you want to compare runners configured to use clang against runners configured with the "default compiler" for a given platform. The mapping is from the "head" runner nickname to the "base" runner nickname.
+- `runner_map`: (optional) If you need to map a runner to a base in a different runner, you can provide that mapping here. For example, with tail-calling, you may want to compare runners configured to use clang against runners configured with the "default compiler" for a given platform. The mapping is from the "head" runner nickname to the "base" runner nickname.
 
 For example: