[3872] fix some misspellings

src/bin/lfc/kea-lfc.xml

@@ -128,7 +128,7 @@
           <command>kea-lfc</command> process.  It may also
           contain configuration entries for other Kea services.
           Currently <command>kea-lfc</command> gets all of its arguments from
-          the comamnd line, in the future it will be extended to get some arguments
+          the command line, in the future it will be extended to get some arguments
           from the config file.
         </para></listitem>
       </varlistentry>
@@ -150,7 +150,7 @@
           Previous or ex lease file - When <command>kea-lfc</command> starts this
           is the result of any previous run of <command>kea-lfc</command>.
           When <command>kea-lfc</command> finishes it is the result of this run.
-          If <command>kea-lfc</command> is interrupted before compelting
+          If <command>kea-lfc</command> is interrupted before completing,
           this file may not exist.
         </para></listitem>
       </varlistentry>

src/bin/perfdhcp/perfdhcp.xml

@@ -764,7 +764,7 @@
                             multicast address FF05::1:3).  The server is
                             mandatory except where the <option>-l</option>
                             option is given to specify an interface, in
-                            which case it defauls to 'all'.
+                            which case it defaults to 'all'.
                         </para>
                     </listitem>
                 </varlistentry>