Update messages which reference book chs. 17-20

With the insertion of a new chapter 17 on async and await to _The Rust Programming Language_, references in compiler output to later chapters need to be updated to avoid confusing users. Redirects exist so that users who click old links will end up in the right place anyway, but this way users will be directed to the right URL in the first place.
rust-lang · Oct 17, 2024 · daa8e32 · daa8e32
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diff --git a/compiler/rustc_mir_build/messages.ftl b/compiler/rustc_mir_build/messages.ftl
@@ -203,7 +203,7 @@ mir_build_lower_range_bound_must_be_less_than_or_equal_to_upper =
 
 mir_build_lower_range_bound_must_be_less_than_upper = lower range bound must be less than upper
 
-mir_build_more_information = for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+mir_build_more_information = for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html
 
 mir_build_moved = value is moved into `{$name}` here
 

diff --git a/compiler/rustc_parse/messages.ftl b/compiler/rustc_parse/messages.ftl
@@ -820,7 +820,7 @@ parse_unexpected_expr_in_pat =
     }, found an expression
 
     .label = not a pattern
-    .note = arbitrary expressions are not allowed in patterns: <https://doc.rust-lang.org/book/ch18-00-patterns.html>
+    .note = arbitrary expressions are not allowed in patterns: <https://doc.rust-lang.org/book/ch19-00-patterns.html>
 
 parse_unexpected_expr_in_pat_const_sugg = consider extracting the expression into a `const`