pgsql: Fix two typos in xlogstats.h and xlogstats.c

Fix two typos in xlogstats.h and xlogstats.c Issue found while browsing this area of the code, introduced and copy-pasted around by 2258e76f90bf. Backpatch-through: 15 Branch -- REL_17_STABLE Details --- https://git.postgresql.org/pg/commitdiff/ede2f6b893219296d953177de11df4f43a593e81

pgsql: Fix two typos in xlogstats.h and xlogstats.c

Fix two typos in xlogstats.h and xlogstats.c Issue found while browsing this area of the code, introduced and copy-pasted around by 2258e76f90bf. Backpatch-through: 15 Branch -- REL_16_STABLE Details --- https://git.postgresql.org/pg/commitdiff/fa30f0cb06a184d13078832efc0052b9792de6f8

pgsql: Fix two typos in xlogstats.h and xlogstats.c

Fix two typos in xlogstats.h and xlogstats.c Issue found while browsing this area of the code, introduced and copy-pasted around by 2258e76f90bf. Backpatch-through: 15 Branch -- REL_15_STABLE Details --- https://git.postgresql.org/pg/commitdiff/5bc057d1f3afe6f6f0d902e3da89aa3770c79ceb

pgsql: Fix two typos in xlogstats.h and xlogstats.c

Fix two typos in xlogstats.h and xlogstats.c Issue found while browsing this area of the code, introduced and copy-pasted around by 2258e76f90bf. Backpatch-through: 15 Branch -- REL_18_STABLE Details --- https://git.postgresql.org/pg/commitdiff/ed047ce0a881e628a17e0a3fe6a19c0faa155563

pgsql: Fix two typos in xlogstats.h and xlogstats.c

Fix two typos in xlogstats.h and xlogstats.c Issue found while browsing this area of the code, introduced and copy-pasted around by 2258e76f90bf. Backpatch-through: 15 Branch -- master Details --- https://git.postgresql.org/pg/commitdiff/3a36543d7d08eef6496fe3511f4cf04cba14f572 Modifie