Fix some links in the guide

Closes #569

Author: alexcrichton

guide/src/web-sys/supporting-more-web-apis.md

@@ -47,20 +47,20 @@
    ```
 
    * <input type="checkbox"/> If the new API is **not** showing up in the docs,
-     rebuild the `web-sys` crate [with logging enabled](/web-sys/logging.html)
+     rebuild the `web-sys` crate [with logging enabled](web-sys/logging.html)
      and look for warning messages that mention your new API. Figure out why
      bindings weren't generated and then add support to `wasm_bindgen_webidl` for
      whatever is needed to generate your API's bindings.
-     
-     > You might find it helpful to view the generated rust bindings, to see if 
-     they are what you would expect. The file will be located at 
+
+     > You might find it helpful to view the generated rust bindings, to see if
+     they are what you would expect. The file will be located at
      `target/wasm32-unknown-unknown/debug/build/web-sys-xxx/out/bindings.rs`,
      where `xxx` is a combinations of numbers and letters that represents your
      build. This file is pretty unintelligable until you run `rustfmt` on it, like
      `rustfmt target/wasm32-unknown-unknown/debug/build/web-sys-xxx/out/bindings.rs`.
 
 4. <input type="checkbox"/> Add a simple test for your new API to
    `crates/web-sys/tests/all/`. See the [`web-sys` testing
-   documentation](/web-sys/testing.html) for details.
+   documentation](web-sys/testing.html) for details.
 
 5. <input type="checkbox"/> Send a pull request! 😊

guide/src/web-sys/testing.md

@@ -10,7 +10,7 @@ cargo test
 
 These tests all use a headless Firefox browser. See the [*Headless Browser
 Tests* section for details on setup and
-configuration.](../contributing.html#headless-browser-tests)
+configuration.](contributing.html#headless-browser-tests)
 
 ## Grouping Tests