Some slight tweaks to 4.3.0 release notes (#805)

docs/releases/4.3.0.rst

@@ -5,10 +5,10 @@ Release notes for IRRd 4.3.0
 .. note::
    4.3.0 was initially released on June 6th, 2023, but was yanked due
    to a packaging error on June 9th, leading to the release of
-   IRRd 4.3.0post1. The main visible issue from the error was that the
+   IRRd 4.3.0.post1. The main visible issue from the error was that the
    documentation of 4.4 was published as 4.3.0.
    If you had previously installed 4.3.0 through PyPI/pip, you can
-   keep running on that version, or update to 4.3.0post1 without
+   keep running on that version, or update to 4.3.0.post1 without
    needing restarts or migrations, as the 4.3.0 and 4.3.0post1 PyPI
    packages have identical code.
 
@@ -212,7 +212,7 @@ The recommended steps to upgrade are:
   to any IRRd scripts during the upgrade process.
 * Stop the IRRd process.
 * Upgrade the IRRd package from within the virtualenv with
-  ``pip install irrd==4.3.0``
+  ``pip install irrd==4.3.0.post1``
 * Run the database migrations, using the
   :ref:`irrd_database_upgrade <deployment-database-upgrade>` command.
   **Important note**: some of the migrations change large amounts of data,