doc: update PG 14 release notes with recent feedback

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210514020141.GQ27406@telsasoft.com

doc/src/sgml/release-14.sgml

@@ -630,6 +630,17 @@ VACUUM now has a PROCESS_TOAST which can be set to false to disable TOAST proces
 </para>
 </listitem>
 
+<listitem>
+<!--
+Author: Tomas Vondra <tomas.vondra@postgresql.org>
+2021-01-17 [7db0cd214] Set PD_ALL_VISIBLE and visibility map bits in COPY FREEZ
+-->
+
+<para>
+Have COPY FREEZE appropriately update page visibility bits (Anastasia Lubennikova, Pavan Deolasee, Jeff Janes)
+</para>
+</listitem>
+
 <listitem>
 <!--
 Author: Peter Geoghegan <pg@bowt.ie>
@@ -2010,6 +2021,17 @@ The postgres_fdw module also now supports this.
 </para>
 </listitem>
 
+<listitem>
+<!--
+Author: Tom Lane <tgl@sss.pgh.pa.us>
+2020-12-11 [8c15a2974] Allow ALTER TYPE to update an existing type's typsubscri
+-->
+
+<para>
+Allow ALTER TYPE to specify or remove a SUBSCRIPT handler (Tom Lane)
+</para>
+</listitem>
+
 <listitem>
 <!--
 Author: Peter Eisentraut <peter@eisentraut.org>
@@ -3288,6 +3310,8 @@ Previously it only checked B-Tree index pages.
 <!--
 Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
 2021-01-13 [756ab2912] Add functions to 'pageinspect' to inspect GiST indexes.
+Author: Peter Geoghegan <pg@bowt.ie>
+2021-02-14 [9e596b65f] Add "LP_DEAD item?" column to GiST pageinspect functions
 -->
 
 <para>
@@ -3331,7 +3355,7 @@ Mark btree_gist functions as parallel safe (Steven Winfield)
     </itemizedlist>
 
     <sect4>
-     <title>Postgres_fdw</title>
+     <title>postgres_fdw</title>
 
      <itemizedlist>