doc: Fix descriptions of some PGC_POSTMASTER parameters.

The following parameters can only be set at server start because
their context is PGC_POSTMASTER, but this information was missing
or incorrectly documented. This commit adds or corrects
that information for the following parameters:

* debug_io_direct
* dynamic_shared_memory_type
* event_source
* huge_pages
* io_max_combine_limit
* max_notify_queue_pages
* shared_memory_type
* track_commit_timestamp
* wal_decode_buffer_size

Backpatched to all supported branches.

Author: Karina Litskevich <litskevichkarina@gmail.com>
Reviewed-by: Chao Li <lic@highgo.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CAHGQGwGfPzcin-_6XwPgVbWTOUFVZgHF5g9ROrwLUdCTfjy=0A@mail.gmail.com
Backpatch-through: 13

doc/src/sgml/config.sgml

@@ -1760,7 +1760,8 @@ include_dir 'conf.d'
        <para>
         Controls whether huge pages are requested for the main shared memory
         area. Valid values are <literal>try</literal> (the default),
-        <literal>on</literal>, and <literal>off</literal>.  With
+        <literal>on</literal>, and <literal>off</literal>.
+        This parameter can only be set at server start. With
         <varname>huge_pages</varname> set to <literal>try</literal>, the
         server will try to request huge pages, but fall back to the default if
         that fails. With <literal>on</literal>, failure to request huge pages
@@ -2273,6 +2274,7 @@ include_dir 'conf.d'
         platform, is generally discouraged because it typically requires
         non-default kernel settings to allow for large allocations (see <xref
         linkend="sysvipc"/>).
+        This parameter can only be set at server start.
        </para>
       </listitem>
      </varlistentry>
@@ -2300,6 +2302,7 @@ include_dir 'conf.d'
         however, it may be useful for debugging, when the
         <literal>pg_dynshmem</literal> directory is stored on a RAM disk, or when
         other shared memory facilities are not available.
+        This parameter can only be set at server start.
        </para>
       </listitem>
      </varlistentry>
@@ -2413,6 +2416,7 @@ include_dir 'conf.d'
         <xref linkend="sql-notify"/> / <xref linkend="sql-listen"/> queue.
         The default value is 1048576. For 8 KB pages it allows to consume
         up to 8 GB of disk space.
+        This parameter can only be set at server start.
        </para>
       </listitem>
      </varlistentry>
@@ -2694,9 +2698,7 @@ include_dir 'conf.d'
         <para>
          Controls the largest I/O size in operations that combine I/O, and silently
          limits the user-settable parameter <varname>io_combine_limit</varname>.
-         This parameter can only be set in
-         the <filename>postgresql.conf</filename> file or on the server
-         command line.
+         This parameter can only be set at server start.
          If this value is specified without units, it is taken as blocks,
          that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
          The maximum possible size depends on the operating system and block
@@ -3967,6 +3969,7 @@ include_dir 'conf.d'
         blocks to prefetch.  If this value is specified without units, it is
         taken as bytes.
         The default is 512kB.
+        This parameter can only be set at server start.
        </para>
       </listitem>
      </varlistentry>
@@ -4692,9 +4695,9 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"'  # Windows
       </term>
       <listitem>
        <para>
-        Record commit time of transactions. This parameter
-        can only be set in <filename>postgresql.conf</filename> file or on the server
-        command line. The default value is <literal>off</literal>.
+        Record commit time of transactions.
+        This parameter can only be set at server start.
+        The default value is <literal>off</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -7010,8 +7013,7 @@ local0.*    /var/log/postgresql
         determines the program name used to identify
         <productname>PostgreSQL</productname> messages in
         the log. The default is <literal>PostgreSQL</literal>.
-        This parameter can only be set in the <filename>postgresql.conf</filename>
-        file or on the server command line.
+        This parameter can only be set at server start.
        </para>
       </listitem>
      </varlistentry>
@@ -12207,6 +12209,7 @@ dynamic_library_path = '/usr/local/lib/postgresql:$libdir'
         main data files, <literal>wal</literal> for WAL files, and
         <literal>wal_init</literal> for WAL files when being initially
         allocated.
+        This parameter can only be set at server start.
        </para>
        <para>
         Some operating systems and file systems do not support direct I/O, so