docs: change "default role" wording to "predefined role"

The new wording was determined to be more accurate.  Also, update
release note links that reference these sections.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.6

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/749f702d13de750b0adaf0aedbcc3c01f078c0c2

Modified Files
--------------
doc/src/sgml/release-11.sgml |  2 +-
doc/src/sgml/user-manag.sgml | 28 ++++++++++++++--------------
2 files changed, 15 insertions(+), 15 deletions(-)

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