Add gregestren and jin to documentation CODEOWNERS for Bazel Github

RELNOTES:
PiperOrigin-RevId: 310358153

CODEOWNERS

diff --git a/CODEOWNERS b/CODEOWNERS
index 566faf9..b737bba 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -35,7 +35,7 @@
 
 # Documentation
 
-/site @aiuto
+/site @aiuto @gregestren @jin
 
 # C++