virsh: Fix POD syntax

The first two hunks fix "Unterminated I<...> sequence" error and the
last one fixes "’=item’ outside of any ’=over’" error.

tools/virsh.pod

@@ -737,7 +737,7 @@ I<bandwidth> specifies copying bandwidth limit in MiB/s, although for
 qemu, it may be non-zero only for an online domain.
 
 =item B<blockcopy> I<domain> I<path> I<dest> [I<bandwidth>] [I<--shallow>]
-[I<--reuse-external>] [I<--raw>] [I<--wait> [I<--verbose]
+[I<--reuse-external>] [I<--raw>] [I<--wait> [I<--verbose>]
 [{I<--pivot> | I<--finish>}] [I<--timeout> B<seconds>] [I<--async>]]
 
 Copy a disk backing image chain to I<dest>. By default, this command
@@ -778,7 +778,7 @@ I<path> specifies fully-qualified path of the disk.
 I<bandwidth> specifies copying bandwidth limit in MiB/s.
 
 =item B<blockpull> I<domain> I<path> [I<bandwidth>] [I<base>]
-[I<--wait> [I<--verbose>] [I<--timeout> B<seconds>] [I<--async]]
+[I<--wait> [I<--verbose>] [I<--timeout> B<seconds>] [I<--async>]]
 
 Populate a disk from its backing image chain. By default, this command
 flattens the entire chain; but if I<base> is specified, containing the
@@ -2943,8 +2943,6 @@ and the monitor uses QMP, then the output will be pretty-printed.  If more
 than one argument is provided for I<command>, they are concatenated with a
 space in between before passing the single command to the monitor.
 
-=back
-
 =item B<qemu-agent-command> I<domain> [I<--timeout> I<seconds> | I<--async> | I<--block>] I<command>...
 
 Send an arbitrary guest agent command I<command> to domain I<domain> through