Update penghuang's WATCHLISTS.

WATCHLISTS

Index: WATCHLISTS
diff --git a/WATCHLISTS b/WATCHLISTS
index 7dd8152d919063ff5efdf1aab3f0317945792728..85a6269ec83c0ec63491fe861e5e982948fd8378 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1014,7 +1014,8 @@
     'linux_sandboxing': ['jln+watch@chromium.org'],
     'linux_seccomp_bpf': ['jln+watch@chromium.org'],
     'supervised_users': ['pam+watch@chromium.org'],
-    'mandoline': ['yzshen+watch@chromium.org'],
+    'mandoline': ['yzshen+watch@chromium.org',
+                  'penghuang+watch-mandoline@chromium.org'],
     'manifest': ['mlamouri+watch-manifest@chromium.org'],
     'md_settings': ['jhawkins+watch-md-settings@chromium.org',
                     'jlklein+watch-md-settings@chromium.org',
@@ -1114,8 +1115,7 @@
     'tcmalloc': ['dmikurube@chromium.org'],
     'telemetry': ['telemetry-reviews@chromium.org'],
     'tests': [],
-    'textinput': ['penghuang+watch@chromium.org',
-                  'suzhe@chromium.org',
+    'textinput': ['suzhe@chromium.org',
                   'yusukes+watch@chromium.org',
                   'nona+watch@chromium.org',
                   'shuchen+watch@chromium.org'],