doc: clarify that auth. names are lower case and case-sensitive

bmomjian · bmomjian · commit 7fa2bdeda62e · 2022-07-21T13:58:26.000-04:00
This is true even for acronyms that are usually upper case, like LDAP. Reported-by: Alvaro Herrera Discussion: https://postgr.es/m/202205141521.2nodjabmsour@alvherre.pgsql Backpatch-through: 10
diff --git a/doc/src/sgml/client-auth.sgml b/doc/src/sgml/client-auth.sgml
@@ -381,7 +381,9 @@ hostnossl  <replaceable>database</replaceable>  <replaceable>user</replaceable>
       <para>
        Specifies the authentication method to use when a connection matches
        this record. The possible choices are summarized here; details
-       are in <xref linkend="auth-methods">.
+       are in <xref linkend="auth-methods">.  All the options
+       are lower case and treated case sensitively, so even acronyms like
+       <literal>ldap</literal> must be specified as lower case.
 
        <variablelist>
         <varlistentry>
