doc: Clarify requirements for SET ROLE.

Since commit 3d14e171e9, SET ROLE has required the current session
user to have membership with the SET option in the target role, but
the SET ROLE documentation only mentions the membership
requirement.  This commit adds this important detail to the SET
ROLE page.

Reviewed-by: Robert Haas
Discussion: 
https://postgr.es/m/CA%2BRLCQysHtME0znk2KUMJN343ksboSRQSU-hCnOjesX6VK300Q%40mail.gmail.com
Backpatch-through: 16

Branch
------
REL_16_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d82dc79ba03c783fa41be768c1bf13cb8200a340

Modified Files
--------------
doc/src/sgml/ref/set_role.sgml | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

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