Document that --sync-method takes an argument.

This was missed in commit 8c16ad3.

Reported-by: Robert Haas
Reviewed-by: Daniel Gustafsson, Robert Haas, Alvaro Herrera, Tom Lane
Discussion: https://postgr.es/m/CA%2BTgmoZi7pcx-ec3oJLWSr2R%3DDn2Zeiyx3EXQKc_1TTvA6Eepg%40mail.gmail.com

doc/src/sgml/ref/initdb.sgml

@@ -366,7 +366,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry id="app-initdb-option-sync-method">
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=<replaceable>method</replaceable></option></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,

doc/src/sgml/ref/pg_basebackup.sgml

@@ -595,7 +595,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry>
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=<replaceable class="parameter">method</replaceable></option></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,

doc/src/sgml/ref/pg_checksums.sgml

@@ -140,7 +140,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry>
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=<replaceable>method</replaceable></option></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,

doc/src/sgml/ref/pg_dump.sgml

@@ -1183,7 +1183,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry>
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=<replaceable class="parameter">method</replaceable></option></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,

doc/src/sgml/ref/pg_rewind.sgml

@@ -285,7 +285,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry>
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=<replaceable class="parameter">method</replaceable></option></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,

doc/src/sgml/ref/pgupgrade.sgml

@@ -191,7 +191,7 @@ PostgreSQL documentation
      </varlistentry>
 
      <varlistentry>
-      <term><option>--sync-method</option></term>
+      <term><option>--sync-method=</option><replaceable>method</replaceable></term>
       <listitem>
        <para>
         When set to <literal>fsync</literal>, which is the default,