improve explanation of "default" profile

Co-authored-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: tshepang

README.md

@@ -74,9 +74,9 @@ available at this time are `minimal`, `default`, and `complete`:
 working compiler (`rustc`, `rust-std`, and `cargo`). It's recommended to use
 this component on Windows systems if you don't use local documentation, and in
 CI.
-* The **default** profile includes all the components previously installed by
-default (`rustc`, `rust-std`, `cargo`, and `rust-docs`) plus `rustfmt` and
-`clippy`. This profile will be used by `rustup` by default, and it's the one
+* The **default** profile includes all of components in the **minimal** profile,
+and adds `rust-docs`, `rustfmt`, and `clippy`.
+This profile will be used by `rustup` by default, and it's the one
 recommended for general use.
 * The **complete** profile includes all the components available through
 `rustup`. This should never be used, as it includes *every* component ever included