describe cargo and don't be vague

nikomatsakis · nikomatsakis · commit 170c48c53970 · 2021-04-12T16:09:11.000-04:00
diff --git a/text/0000-edition-2021.md b/text/0000-edition-2021.md
@@ -102,7 +102,7 @@ Migrations typically come with one or more **migration lints**. Each lint warns
 
 ## Default edition for new projects
 
-The default edition for new projects will be 2021.
+The default edition for new projects created within cargo or other tooling will be 2021.
 
 ## RFCs that propose edition changes
 
