DOCS-15009 finalize 4.2.18 release notes (#238)

* DOCS-15009 finalize 4.2.18 release notes

* Update build_config.yaml

Author: ianf-mongodb

config/build_conf.yaml

@@ -10,7 +10,7 @@ project:
   branched: true
   siteroot: true
 version:
-  release: '4.2.17'
+  release: '4.2.18'
   branch: '4.2'
 system:
   files:

source/includes/changelogs/releases/4.2.18.rst

@@ -15,7 +15,6 @@ Sharding
 - :issue:`SERVER-59160` Disable balancer in test_stacked_migration_cleanup.js
 - :issue:`SERVER-59916` T{1, 2}Starts{First, Second}AndWins In WriteConflictHelpers Does Not Synchronize Committing Of Failed Transaction
 - :issue:`SERVER-60653` Backport the autoSplitVector logic to v4.2
-- :issue:`SERVER-61924` retryable_mongos_write_errors.js fails in 4.2 multiversion suites due to missing failpoint command in 4.0
 
 Replication
 ~~~~~~~~~~~
@@ -43,7 +42,6 @@ Operations
 Internals
 ~~~~~~~~~
 
-- :issue:`SERVER-51087` Add testing utility for creating an empty sharded collection with the specified bounds
 - :issue:`SERVER-52976` [4.2] collection_validation.cpp isn't used anywhere in the 4.2 branch
 - :issue:`SERVER-53726` Platform Support: Remove RHEL6 zSeries
 - :issue:`SERVER-55589` replSetMaintenance command does not take the RSTL

source/release-notes/4.2.txt

@@ -23,8 +23,8 @@ Minor Releases
 
 .. _4.2.18-release-notes:
 
-4.2.18 - Upcoming
-~~~~~~~~~~~~~~~~~
+4.2.18 - Jan 6, 2022
+~~~~~~~~~~~~~~~~~~~~
 
 Issues fixed in 4.2.18: