powerpc64-ibm-aix: update maintainters

Chaofan and Kai will be passing over maintainership for the target over to David Tenty and Chris Cambly.

Author: daltenty

Diff for: src/doc/rustc/src/platform-support/aix.md

@@ -6,8 +6,8 @@ Rust for AIX operating system, currently only 64-bit PowerPC is supported.
 
 ## Target maintainers
 
-- QIU Chaofan `qiucofan@cn.ibm.com`, https://github.com/ecnelises
-- Kai LUO, `lkail@cn.ibm.com`, https://github.com/bzEq
+- David Tenty `daltenty@ibm.com`, https://github.com/daltenty
+- Chris Cambly, `ccambly@ca.ibm.com`, https://github.com/gilamn5tr
 
 ## Requirements