pgsql: Fix wording - Mailing list pgsql-committers

Fix wording

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/cc788c55bbb031d6168daf71f208e7a73f41e48a

Modified Files
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doc/src/sgml/rules.sgml                     | 2 +-
src/backend/utils/adt/rangetypes_selfuncs.c | 2 +-
src/backend/utils/adt/rangetypes_spgist.c   | 6 +++---
src/bin/pg_resetwal/pg_resetwal.c           | 2 +-
4 files changed, 6 insertions(+), 6 deletions(-)