Documentation fixes.

Fix broken link to target documentation.

Also fix formatting of developer list.

Author: mikeleany

src/doc/rustc/src/SUMMARY.md

@@ -15,6 +15,7 @@
 - [Platform Support](platform-support.md)
     - [aarch64-apple-ios-sim](platform-support/aarch64-apple-ios-sim.md)
     - [\*-kmc-solid_\*](platform-support/kmc-solid.md)
+    - [x86_64-unknown-none](platform-support/x86_64-unknown-none.md)
 - [Target Tier Policy](target-tier-policy.md)
 - [Targets](targets/index.md)
     - [Built-in Targets](targets/built-in.md)

src/doc/rustc/src/platform-support/x86_64-unknown-none.md

@@ -6,8 +6,8 @@ Freestanding/bare-metal x86-64 binaries in ELF format: firmware, kernels, etc.
 
 ## Target maintainers
 
-Harald Hoyer <[email protected]>, https://github.com/haraldh
-Mike Leany, https://github.com/mikeleany
+- Harald Hoyer <[email protected]>, https://github.com/haraldh
+- Mike Leany, https://github.com/mikeleany
 
 ## Requirements