Mention tooling such as blame.ignoreRevsFile

Author: joshtriplett

text/3338-style-evolution.md

@@ -45,12 +45,16 @@ style as the Rust edition used for parsing.
 
 However, when transitioning between editions, projects may want to separately
 make and commit the changes for 1) transitioning to a new Rust edition and 2)
-transitioning to a new style edition. To allow for this, `rustfmt` also allows
-configuring the style edition directly, via a separate `style_edition`
-configuration option, or `--style-edition` command-line option. `style_edition`
-or `--style-edition`, if set, always overrides `edition` or `--edition` for the
-purposes of styling, though `edition` or `--edition` still determines the
-edition for the purposes of parsing Rust code.
+transitioning to a new style edition. Keeping formatting changes in a separate
+commit also helps tooling ignore that commit, such as with git's
+`blame.ignoreRevsFile`.
+
+To allow for this, `rustfmt` also allows configuring the style edition
+directly, via a separate `style_edition` configuration option, or
+`--style-edition` command-line option. `style_edition` or `--style-edition`, if
+set, always overrides `edition` or `--edition` for the purposes of styling,
+though `edition` or `--edition` still determines the edition for the purposes
+of parsing Rust code.
 
 Note that rustfmt may not necessarily support all combinations of Rust edition
 and style edition; in particular, it may not support using a style edition that