pgsql: Document "B" as an accepted unit in postgres.conf.sample

Document "B" as an accepted unit in postgres.conf.sample

In postgresql.conf, memory and file size GUCs can be specified with "B"
(bytes) as of b06d8e58b.

Pavel Luzanov

This is a backpatch to v11 of a portion of bb95feabb.

Discussion: https://www.postgresql.org/message-id/flat/f10d16fc-8fa0-1b3c-7371-cb3a35a13b7a%40postgrespro.ru

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/7155e0522fbf1403711ce712f48d346c0c85c179

Modified Files
--------------
src/backend/utils/misc/postgresql.conf.sample | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)