[WIP] Rewrite SoapClient constructor documentation

This constructor takes a large number of options, most of which
were effectively undocumented, leading to a very high volume of
User Notes.

Author: IMSoP

reference/soap/constants.xml

@@ -21,15 +21,23 @@
       (<type>int</type>)
      </entry>
      <entry>1</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of SOAP 1.1 when passed as <literal>soap_version</literal>
+      option to <function>SoapServer::construct</function> or
+      <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-1-2">
      <entry>
       <constant>SOAP_1_2</constant>
       (<type>int</type>)
      </entry>
      <entry>2</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of SOAP 1.2 when passed as <literal>soap_version</literal>
+      option to <function>SoapServer::construct</function> or
+      <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-persistence-session">
      <entry>
@@ -61,31 +69,43 @@
       (<type>int</type>)
      </entry>
      <entry>1</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of SOAP Encoding when passed as <literal>use</literal>
+      option to <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-literal">
      <entry>
       <constant>SOAP_LITERAL</constant>
       (<type>int</type>)
      </entry>
      <entry>2</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of service-specific encoding when passed as <literal>use</literal>
+      option to <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-rpc">
      <entry>
       <constant>SOAP_RPC</constant>
       (<type>int</type>)
      </entry>
      <entry>1</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of RPC-style binding when passed as <literal>style</literal>
+      option to <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-document">
      <entry>
       <constant>SOAP_DOCUMENT</constant>
       (<type>int</type>)
      </entry>
      <entry>2</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of document binding when passed as <literal>style</literal>
+      option to <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-actor-next">
      <entry>
@@ -141,15 +161,23 @@
       (<type>int</type>)
      </entry>
      <entry>0</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of HTTP Basic Authentication when passed as
+      <literal>authentication</literal> option to
+      <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-authentication-digest">
      <entry>
       <constant>SOAP_AUTHENTICATION_DIGEST</constant>
       (<type>int</type>)
      </entry>
      <entry>1</entry>
-     <entry></entry>
+     <entry>
+      Specifies use of HTTP Digest Authentication when passed as
+      <literal>authentication</literal> option to
+      <function>SoapClient::construct</function>.
+     </entry>
     </row>
     <row xml:id="constant.soap-ssl-method-tls">
      <entry>