chore: one changelog for each PR

Author: SteveLauC

towncrier.toml

@@ -20,7 +20,7 @@ issue_format = "[#{issue}](https://github.com/nix-rust/nix/pull/{issue})"
 start_string = "# Change Log\n"
 
 # nix's change log typs (in alphabetical order)
-# These types will be capitalized default.
+# These types will be capitalized by default.
 [tool.towncrier.fragment.added]
 [tool.towncrier.fragment.changed]
 [tool.towncrier.fragment.fixed]