Rust 2024: update edition info in keywords appendix

src/appendix-01-keywords.md

@@ -69,6 +69,9 @@ Rust for potential future use.
 - `box`
 - `do`
 - `final`
+
+* `gen`
+
 - `macro`
 - `override`
 - `priv`
@@ -124,14 +127,14 @@ This code will compile without any errors. Note the `r#` prefix on the function
 name in its definition as well as where the function is called in `main`.
 
 Raw identifiers allow you to use any word you choose as an identifier, even if
-that word happens to be a reserved keyword. This gives us more freedom to
-choose identifier names, as well as lets us integrate with programs written in
-a language where these words aren’t keywords. In addition, raw identifiers
-allow you to use libraries written in a different Rust edition than your crate
-uses. For example, `try` isn’t a keyword in the 2015 edition but is in the 2018
-edition. If you depend on a library that’s written using the 2015 edition and
-has a `try` function, you’ll need to use the raw identifier syntax, `r#try` in
-this case, to call that function from your 2018 edition code. See [Appendix
-E][appendix-e]<!-- ignore --> for more information on editions.
+that word happens to be a reserved keyword. This gives us more freedom to choose
+identifier names, as well as lets us integrate with programs written in a
+language where these words aren’t keywords. In addition, raw identifiers allow
+you to use libraries written in a different Rust edition than your crate uses.
+For example, `try` isn’t a keyword in the 2015 edition but is in the 2018, 2021,
+and 2024 editions. If you depend on a library that’s written using the 2015
+edition and has a `try` function, you’ll need to use the raw identifier syntax,
+`r#try` in this case, to call that function from your 2018 edition code. See
+[Appendix E][appendix-e]<!-- ignore --> for more information on editions.
 
 [appendix-e]: appendix-05-editions.html