Clarify behavior of initdb's --allow-group-access on Windows in docs
Clarify behavior of initdb's --allow-group-access on Windows in docs

The option is ignored on Windows, and GUC data_directory_mode already
mentioned that within its description in the documentation.

Author: Michael Paquier
Reported-by: Haribabu Kommi, David Steele
Discussion: 4c60a4f3a0861b578fb171a15033f33fceca7a8d@mail.gmail.com
Backpatch-through: 11

adam8157/gpdb,xinzweb/gpdb,lisakowen/gpdb,greenplum-db/gpdb,50wu/gpdb,adam8157/gpdb,lisakowen/gpdb,greenplum-db/gpdb,50wu/gpdb,adam8157/gpdb,xinzweb/gpdb,xinzweb/gpdb,xinzweb/gpdb,xinzweb/gpdb,adam8157/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,xinzweb/gpdb,lisakowen/gpdb,50wu/gpdb,adam8157/gpdb,greenplum-db/gpdb,50wu/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,adam8157/gpdb,xinzweb/gpdb,adam8157/gpdb,lisakowen/gpdb,50wu/gpdb,lisakowen/gpdb,greenplum-db/gpdb,50wu/gpdb,xinzweb/gpdb,adam8157/gpdb,lisakowen/gpdb,50wu/gpdb,lisakowen/gpdb,50wu/gpdb,lisakowen/gpdb