pgsql: docs: document behavior of CHAR() comparisons with chars < space

docs: document behavior of CHAR() comparisons with chars < space

Space trimming rather than space-padding causes unusual behavior, which
might not be standards-compliant.

Also remove recently-added now-redundant C comment.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/8457d0beca731bf062bb0d126870d9a291ab47a5

Modified Files
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doc/src/sgml/datatype.sgml | 11 +++++++----
src/backend/utils/adt/varchar.c | 12 ------------
2 files changed, 7 insertions(+), 16 deletions(-)

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