Adds release notes for 2.2.3, 2.2.4 (#330)

* Adds release notes for 2.2.3, 2.2.4

* Fixes mongosh monospace

* Resolves internal review comments

Author: mdb-ashley

source/changelog.txt

@@ -12,6 +12,43 @@ Release Notes
    :depth: 1
    :class: singlecol
 
+v2.2.4
+------
+
+*Released April 15, 2024*
+
+Upgrades to Node.js version 20.12.2. Node 20.12.2 resolves security issues. Vulnerabilities 
+are unlikely to affect typical ``mongosh`` users. For more information, see the 
+`April 10, 2024 Node.js security release
+<https://nodejs.org/en/blog/vulnerability/april-2024-security-releases-2/>`__.
+
+`Full release notes available on JIRA 
+<https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=17381&version=38886>`__.
+
+
+v2.2.3
+------
+
+*Released April 4, 2024*
+
+Issues fixed:
+
+- :issue:`MONGOSH-1752` - Updates Node.js version to 20.12.1. Node 20.12.1 resolves 
+  security issues. Vulnerabilities are unlikely to affect typical ``mongosh`` users. For
+  more information, see the `April 3, 2024 Node.js security release 
+  <https://nodejs.org/en/blog/vulnerability/april-2024-security-releases/>`__.
+
+- :issue:`MONGOSH-1682` - Fixed a race condition that could lead to commands, including 
+  sensitive information, not being properly redacted from the history file.
+
+- :issue:`MONGOSH-1688` - Improved cursor iteration performance by ~60%.
+
+- :issue:`MONGOSH-1751` - Improved startup performance for programmatic usage by 
+  addressing a bug in our update notification manager.
+
+`Full release notes available on JIRA 
+<https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=17381&version=38351>`__.
+
 v2.2.2
 ------