[4259] Address review comments, part II

    Fixed minor typos.

doc/guide/dhcp4-srv.xml

@@ -2122,7 +2122,7 @@ It is merely echoed by the server
     Note that formerly, this parameter was a boolean and permitted only values
     of <command>true</command> and <command>false</command>.  Boolean values
     will still be accepted but may eventually be deprecated. A value of
-    <command>true</command> equates to <command>when_present</command>,
+    <command>true</command> equates to <command>when-present</command>,
     <command>false</command> equates to <command>never</command>.
     </note>
 

doc/guide/dhcp6-srv.xml

@@ -2090,7 +2090,7 @@ should include options from the isc option space:
     Note that formerly, this parameter was a boolean and permitted only values
     of <command>true</command> and <command>false</command>.  Boolean values
     will still be accepted but may eventually be deprecated. A value of
-    <command>true</command> equates to <command>when_present</command>,
+    <command>true</command> equates to <command>when-present</command>,
     <command>false</command> equates to <command>never</command>.
     </note>
 

src/bin/dhcp4/tests/fqdn_unittest.cc

@@ -462,7 +462,7 @@ public:
     }
 
 
-    /// @brief  Invokes Dhcpsrv4::processHostname on the given packet
+    /// @brief  Invokes Dhcpv4Srv::processHostname on the given packet
     ///
     /// Processes the Hostname option in the client's message and returns
     /// the hostname option which would be sent to the client. It will