[3513] Added some texts (to improve) about -W & co in guides

doc/guide/ddns.xml

@@ -91,14 +91,29 @@
               additional parameters and exits.
             </simpara>
           </listitem>
+          <listitem>
+            <simpara>
+              <command>-W</command> - prints out Kea configuration report
+              and exits.
+            </simpara>
+          </listitem>
       </itemizedlist>
 
       <para>
+            The <command>-V</command> returns the versions of the
+            external libraries dynamically linked, at the opposite
+            the <command>-W</command> describes the environment used
+            to build Kea.
+      </para>
+
+      <para>
             All of the executable binaries in Kea contain an embedded
             copy of the <filename>config.report</filename>
-            file produced by <userinput>./configure</userinput>.
+            file produced by <userinput>./configure</userinput>
+            and displayed by the <command>-W</command> command,
+            but is accessible in some other ways when needed.
             The following command may be used to extract this information.
-            The binary <userinput>path</userinput>, may be found in the
+            The binary <userinput>path</userinput> may be found in the
             install directory or in the <filename>.libs</filename>
             subdirectory in the source treee. For example
             <filename>kea/src/bin/d2/.libs/kea-dhcp-ddns</filename>.

doc/guide/dhcp4-srv.xml

@@ -55,14 +55,29 @@
               additional parameters and exits.
             </simpara>
           </listitem>
+          <listitem>
+            <simpara>
+              <command>-W</command> - prints out Kea configuration report
+              and exits.
+            </simpara>
+          </listitem>
       </itemizedlist>
 
       <para>
+            The <command>-V</command> returns the versions of the
+            external libraries dynamically linked, at the opposite
+            the <command>-W</command> describes the environment used
+            to build Kea.
+      </para>
+
+      <para>
             All of the executable binaries in Kea contain an embedded
             copy of the <filename>config.report</filename>
-            file produced by <userinput>./configure</userinput>.
+            file produced by <userinput>./configure</userinput>
+            and displayed by the <command>-W</command> command,
+            but is accessible in some other ways when needed.
             The following command may be used to extract this information.
-            The binary <userinput>path</userinput>, may be found in the
+            The binary <userinput>path</userinput> may be found in the
             install directory or in the <filename>.libs</filename>
             subdirectory in the source treee. For example
             <filename>kea/src/bin/dhcp4/.libs/kea-dhcp4</filename>.

doc/guide/dhcp6-srv.xml

@@ -53,14 +53,29 @@
               additional parameters and exits.
             </simpara>
           </listitem>
+          <listitem>
+            <simpara>
+              <command>-W</command> - prints out Kea configuration report
+              and exits.
+            </simpara>
+          </listitem>
       </itemizedlist>
 
       <para>
+            The <command>-V</command> returns the versions of the
+            external libraries dynamically linked, at the opposite
+            the <command>-W</command> describes the environment used
+            to build Kea.
+      </para>
+
+      <para>
             All of the executable binaries in Kea contain an embedded
             copy of the <filename>config.report</filename>
-            file produced by <userinput>./configure</userinput>.
+            file produced by <userinput>./configure</userinput>
+            and displayed by the <command>-W</command> command,
+            but is accessible in some other ways when needed.
             The following command may be used to extract this information.
-            The binary <userinput>path</userinput>, may be found in the
+            The binary <userinput>path</userinput> may be found in the
             install directory or in the <filename>.libs</filename>
             subdirectory in the source treee. For example
             <filename>kea/src/bin/dhcp6/.libs/kea-dhcp6</filename>.