pgsql: Fix typos and inconsistencies in code and comments

Fix typos and inconsistencies in code and comments

This change is a cocktail of harmonization of function argument names,
grammar typos, renames for better consistency and unused code (see
ltree).  All of these have been spotted by the author.

Author: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/b2c0d0b7-3944-487d-a03d-d155851958ff@gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b8cfcb9e00da6f2149f5977e99bdcf3121fea0aa

Modified Files
--------------
contrib/ltree/ltxtquery_io.c                     | 5 -----
doc/src/sgml/ref/create_subscription.sgml        | 2 +-
src/backend/access/heap/heapam.c                 | 2 +-
src/backend/access/heap/heapam_xlog.c            | 2 +-
src/backend/access/rmgrdesc/gindesc.c            | 2 +-
src/backend/commands/subscriptioncmds.c          | 2 +-
src/backend/nodes/queryjumblefuncs.c             | 2 +-
src/backend/optimizer/plan/analyzejoins.c        | 2 +-
src/backend/optimizer/plan/planner.c             | 4 ++--
src/backend/optimizer/util/plancat.c             | 2 +-
src/backend/partitioning/partbounds.c            | 2 +-
src/backend/replication/logical/slotsync.c       | 2 +-
src/backend/storage/buffer/bufmgr.c              | 2 +-
src/backend/storage/lmgr/predicate.c             | 2 +-
src/backend/utils/init/postinit.c                | 2 +-
src/backend/utils/misc/guc_parameters.dat        | 2 +-
src/bin/pg_upgrade/t/007_multixact_conversion.pl | 2 +-
src/include/access/heapam.h                      | 2 +-
src/include/c.h                                  | 2 +-
src/include/commands/sequence.h                  | 2 +-
src/include/common/int128.h                      | 2 +-
src/include/jit/llvmjit.h                        | 2 +-
src/include/nodes/pathnodes.h                    | 2 +-
src/include/optimizer/geqo_recombination.h       | 4 ++--
src/include/port.h                               | 2 +-
src/include/port/win32/sys/socket.h              | 2 +-
src/include/port/win32_port.h                    | 6 +++---
src/include/replication/logicalctl.h             | 3 +--
src/include/replication/worker_internal.h        | 2 +-
src/include/statistics/stat_utils.h              | 2 +-
src/include/storage/predicate.h                  | 2 +-
src/include/utils/guc.h                          | 6 +++---
src/test/modules/brin/t/01_workitems.pl          | 2 +-
src/test/recovery/t/048_vacuum_horizon_floor.pl  | 4 ++--
src/tools/valgrind.supp                          | 2 +-
35 files changed, 41 insertions(+), 47 deletions(-)