fix: List out custom profiles

Author: epage

text/3502-cargo-script.md

@@ -408,6 +408,8 @@ or `cargo read-manifest --manifest-path <file>.rs`
 
 Users may be using this feature for heavier duty scripting and want optimized builds.
 - This can be worked around by changing `profile.dev` in the embedded manifest
+- We could make `profile.run` official and make cargo script use that
+  - The custom profiles don't reuse artifacts with the inherited profile but get a separate `target/<profile>`
 
 Like with all cargo packages, the `target/` directory grows unbounded.
 This is made worse by them being out of the way and the scripts are likely to be short-lived,