Fix broken links

src/appendix-01-keywords.md

@@ -126,4 +126,4 @@ has a `try` function, to call that function from your 2018 edition code, you’l
 need to use the raw identifier syntax, `r#try` in this case. See [Appendix
 E][appendix-e] for more information on editions.
 
-[appendix-e]: appendix-05-editions.md
+[appendix-e]: appendix-05-editions.html

src/ch03-02-data-types.md

@@ -414,4 +414,4 @@ continuing. Chapter 9 discusses more of Rust’s error handling.
 ch02-00-guessing-game-tutorial.html#comparing-the-guess-to-the-secret-number
 [control-flow]: ch03-05-control-flow.html#control-flow
 [strings]: ch08-02-strings.html#storing-utf-8-encoded-text-with-strings
-[unrecoverable-errors-with-panic]: ch09-01-unrecoverable-errors-with-panic.md
+[unrecoverable-errors-with-panic]: ch09-01-unrecoverable-errors-with-panic.html

src/ch04-01-what-is-ownership.md

@@ -556,6 +556,6 @@ common. Luckily for us, Rust has a feature for this concept, called
 *references*.
 
 [data-types]: ch03-02-data-types.html#data-types
-[derivable-traits]: appendix-03-derivable-traits.html#derivable-traits
+[derivable-traits]: appendix-03-derivable-traits.html
 [method-syntax]: ch05-03-method-syntax.html#method-syntax
 [paths-module-tree]: ch07-02-modules-and-use-to-control-scope-and-privacy.html#paths-for-referring-to-an-item-in-the-module-tree

src/ch11-01-writing-tests.md

@@ -846,6 +846,6 @@ test`.
 ch08-02-strings.html#concatenation-with-the--operator-or-the-format-macro
 [controlling-how-tests-are-run]:
 ch11-02-running-tests.html#controlling-how-tests-are-run
-[derivable-traits]: appendix-03-derivable-traits.html#derivable-traits
+[derivable-traits]: appendix-03-derivable-traits.html
 [doc-comments]: ch14-02-publishing-to-crates-io.html#documentation-comments-as-tests
 [modules-as-privacy-boundary]: ch07-02-modules-and-use-to-control-scope-and-privacy.html#modules-as-the-privacy-boundary

src/ch19-01-unsafe-rust.md

@@ -541,5 +541,5 @@ ch04-02-references-and-borrowing.html#dangling-references
 [differences-between-variables-and-constants]:
 ch03-01-variables-and-mutability.html#differences-between-variables-and-constants
 [extensible-concurrency-with-the-sync-and-send-traits]:
-ch16-04-extensible-concurrency-sync-and-sen.html#extensible-concurrency-with-the-sync-and-send-traits
+ch16-04-extensible-concurrency-sync-and-send.html#extensible-concurrency-with-the-sync-and-send-traits
 [the-slice-type]: ch04-03-slices.html#the-slice-type