Correct some misuses of "its" and "it's".

Also expand some contractions of the same, discovered while I was
hunting down the above.

This commit can very likely be ignored by translation teams.

en_US.ISO8859-1/articles/console-server/article.sgml

@@ -1640,7 +1640,7 @@ exit 0</programlisting>
 	    </listitem>
 
 	    <listitem>
-	      <para>Fix dates.  It's July, already!</para>
+	      <para>Fix dates.  It is July, already!</para>
 	    </listitem>
 
 	    <listitem>

en_US.ISO8859-1/articles/filtering-bridges/article.sgml

@@ -185,7 +185,7 @@ firewall_logging="YES"</programlisting>
       without being filtered, even if the firewall is configured to not permit
       anything.</para>
 
-    <para>Now it's time to reboot the system and use it as before: there will
+    <para>Now it is time to reboot the system and use it as before: there will
       be some new messages about the bridge and the firewall, but the bridge
       will not be activated and the firewall, being in <option>open</option> mode, will not
       avoid any operations.</para>
@@ -246,7 +246,7 @@ firewall_logging="YES"</programlisting>
       as a single session. But with a firewall that can <quote>remember</quote> an outgoing
       <acronym>UDP</acronym> packet and, for the next few minutes, allow a
       response, handling <acronym>UDP</acronym> services is trivial. The
-      following example shows how to do it. It's possible to do the same thing
+      following example shows how to do it. It is possible to do the same thing
       with <acronym>TCP</acronym> packets. This allows you to avoid some
       denial of service attacks and other nasty tricks, but it also typically
       makes your state table grow quickly in size.</para>
@@ -302,7 +302,7 @@ add pass tcp from any to any 22 in via fxp0 setup keep-state
 add pass tcp from any to relay 25 in via fxp0 setup keep-state
 # Allow zone transfers only by the slave name server [dns2.nic.it]
 add pass tcp from 193.205.245.8 to ns 53 in via fxp0 setup keep-state
-# Pass ident probes.  It's better than waiting for them to timeout
+# Pass ident probes.  It is better than waiting for them to timeout
 add pass tcp from any to any 113 in via fxp0 setup keep-state
 # Pass the "quarantine" range
 add pass tcp from any to any 49152-65535 in via fxp0 setup keep-state

en_US.ISO8859-1/articles/hubs/article.sgml

@@ -231,7 +231,7 @@
           the synced module in terms of the number of directories and 
           files. <application>rsync</application> can use <command>rsh</command> and
           <command>ssh</command> (now default) as a transport,
-          or use it's own protocol for stand-alone access
+          or use its own protocol for stand-alone access
           (this is the preferred method for public rsync servers).
           Authentication, connection limits, and other restrictions
           may be applied. There is just one software package

en_US.ISO8859-1/articles/multi-os/article.sgml

@@ -547,7 +547,7 @@ Press Esc to continue
       <para>One thing we just brushed past that is important to know.
 	All of your hard disks have MBRs.  However, the one that is
 	important is the one on the disk that is first probed by the
-	BIOS.  If you have only IDE hard disks, its the first IDE disk
+	BIOS.  If you have only IDE hard disks, it is the first IDE disk
 	(e.g. primary disk on first controller).  Similarly for SCSI
 	only systems.  If you have both IDE and SCSI hard disks
 	though, the IDE disk is typically probed first by the BIOS, so

en_US.ISO8859-1/articles/pr-guidelines/article.sgml

@@ -470,7 +470,7 @@ This was misfiled because the subject didn't have the format:
 	  plain text messages.  This doesn't happen a lot of the time,
 	  but it can be fixed with <command>edit-pr</command> too; it
 	  does require a bit of work from the developer who refiles the
-	  PR, but it's relatively easy to do most of the time.</para>
+	  PR, but it is relatively easy to do most of the time.</para>
       </section>
 
       <section id="pr-misfiled-notpr">