Fix typos and inconsistencies for HEAD (take 8)

Hello hackers,

Please consider fixing the next set of typos and inconsistencies in the
tree:
8.1. LABORT -> LIKE_ABORT
8.2. LagTrackerWriter -> LagTrackerWrite
8.3. lag_with_offset_and_default, * ->
window_lag_with_offset_and_default, window_* (in windowfuncs.c)
8.4. language-name -> language_name
8.5. lastOverflowedXID -> lastOverflowedXid
8.6. last_processed -> last_processing
8.7. last-query -> last_query
8.8. lastsysoid -> datlastsysoid
8.9. lastUsedPage -> lastUsedPages
8.10. lbv -> lbsv
8.11. leafSegment -> leafSegmentInfo
8.12. LibraryName/SymbolName -> remove (orphaned after f9143d10)
8.13. licence -> license
8.14. LINE_ALLOC -> remove (orphaned since 12ee6ec7)
8.15. local_ip_addr, local_port_addr -> remove and update a comment
(orphaned since b4cea00a)
8.16. local_passwd.c -> update a comment (see
http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/passwd/local_passwd.c.diff?r1=1.19&r2=1.20
)
8.17. localTransactionid -> localTransactionId
8.18. LocalTransactionID -> localTransactionId
8.19. LOCKDEF_H_ -> LOCKDEFS_H_
8.20. LOCK_H -> LOCK_H_
8.21. lockid -> lock
8.22. LOGICAL_PROTO_VERSION_NUM, PGLOGICAL_PROTO_MIN_VERSION_NUM ->
LOGICALREP_PROTO_VERSION_NUM, LOGICALREP_PROTO_MIN_VERSION_NUM
8.23. LOGICALREP_PROTO_H -> LOGICAL_PROTO_H
8.24. LogicalRewriteHeapCheckpoint -> CheckPointLogicalRewriteHeap
8.25. log_snap_interval_ms -> LOG_SNAPSHOT_INTERVAL_MS
8.26. from LVT -> form LVT
8.27. lwlockMode -> lwWaitMode
8.28. LWLockWait -> LWLockWaitForVar
8.29. MacroAssert -> AssertMacro
8.30. maintainer-check -> remove (orphaned after 5dd41f35)
8.31. manip.c -> remove (not present since PG95-1_01)
8.32. markleftchild -> markfollowright
8.33. mask_page_lsn -> mask_page_lsn_and_checksum
8.34. mdfd_seg_fds -> md_seg_fds
8.35. md_update -> px_md_update
8.36. meg -> 1 MB
8.37. MIGRATOR_API_VERSION -> remove (orphaned after 6f56b41a)
8.38. min_apply_delay -> recovery_min_apply_delay
8.39. min_multi -> cutoff_multi
8.40. minwg -> mingw
8.41. missingok -> missing_ok
8.42. mksafefunc/mkunsafefunc -> mkfunc (orphaned after 1f474d29)
8.43. MSG000001.bin -> MSG00001.bin
8.44. MSPACE -> MSSPACE
8.45. mtransfunc -> mtransfn
8.46. MULTI_QUERY -> PORTAL_MULTI_QUERY
8.47. MultixactId -> MultiXactId
8.48. MVDistinctItem -> MVNDistinctItem

In passing, I found a legacy script, FAQ2txt, that should be deleted as
unusable.

Best regards,
Alexander