Expand Application Services Book to include indexes for more rustdoc …

…components.

docs/SUMMARY.md

@@ -40,5 +40,19 @@
 - [Releases](howtos/releases.md)
   - [CI Publishing tools and flow](build-and-publish-pipeline.md)
   - [How to upgrade NSS](howtos/upgrading-nss-guide.md)
-- [Rustdocs for components](rust-docs/fxa_client/index.html)
+- Rustdocs for components
+  - [as_ohttp_client](rust-docs/as_ohttp_client/index.html)
+  - [autofill](rust-docs/autofill/index.html)
+  - [crashtest](rust-docs/crashtest/index.html)
+  - [fxa_client](rust-docs/fxa_client/index.html)
+  - [logins](rust-docs/logins/index.html)
+  - [nimbus](rust-docs/nimbus/index.html)
+  - [places](rust-docs/places/index.html)
+  - [push](rust-docs/push/index.html)
+  - [remote_settings](rust-docs/remote_settings/index.html)
+  - [search](rust-docs/search/index.html)
+  - [sync15](rust-docs/sync15/index.html)
+  - [tabs](rust-docs/tabs/index.html)
+  - [viaduct](rust-docs/viaduct/index.html)
+  - [webext_storage](rust-docs/webext_storage/index.html)
 - [Adding to these documents](adding-docs.md)