doc: Remove claims that initdb and pg_ctl use libpq environment variables

Erroneously introduced by 571df93cff.

Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/8458c9c5-18f1-46d7-94c4-1c30e4f44908%40eisentraut.org

doc/src/sgml/ref/initdb.sgml

@@ -558,12 +558,6 @@ PostgreSQL documentation
    </varlistentry>
   </variablelist>
 
-  <para>
-   This utility, like most other <productname>PostgreSQL</productname> utilities,
-   also uses the environment variables supported by <application>libpq</application>
-   (see <xref linkend="libpq-envars"/>).
-  </para>
-
  </refsect1>
 
  <refsect1>

doc/src/sgml/ref/pg_ctl-ref.sgml

@@ -578,13 +578,6 @@ PostgreSQL documentation
    unless <envar>PGDATA</envar> is set.
   </para>
 
-  <para>
-   <command>pg_ctl</command>, like most other <productname>PostgreSQL</productname>
-   utilities,
-   also uses the environment variables supported by <application>libpq</application>
-   (see <xref linkend="libpq-envars"/>).
-  </para>
-
   <para>
    For additional variables that affect the server,
    see <xref linkend="app-postgres"/>.