doc: modify chair to Yu Wang

Tracked-On: projectacrn#8746
Signed-off-by: YuhuanX Huang <[email protected]>

CONTRIBUTING.rst

@@ -48,7 +48,7 @@ the TSC and its membership, are described in the project's `technical-charter`_.
 
 These are the current TSC voting members and chair person:
 
-- Junjie Mao (chair): junjie.mao@intel.com
+- Yu Wang (chair): yu1.wang@intel.com
 - Helmut Buchsbaum: [email protected]
 - Thomas Gleixner: [email protected]