doc:  clarify that pg_global can _only_ be used for system tabs.

Reported-by: zhoushulin1...@gmail.com

Discussion: 
https://postgr.es/m/160499688847.25495.8682880307938679...@wrigleys.postgresql.org

Backpatch-through: master

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8680bae8463a0b213893ca6a1c5bb2c2530e823c

Modified Files
--------------
doc/src/sgml/manage-ag.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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