man/openrc-run.8: add missing "Xo" tags for fstabinfo and mountinfo.

The BUILTINS are all surrounded by Xo...Xc tags, but the opening "Xo"
was missing from the two commands fstabinfo and mountinfo. This commit
adds them, and thereby fixes the spacing when viewed by man.

This is for #204.

man/openrc-run.8

@@ -470,6 +470,7 @@ Also, the -d, -f or -p options should not be specified along with this option.
 .Pp
 The -q option suppresses all informational output. If it is specified
 twice, all error messages are suppressed as well.
+.It Xo
 .Ic fstabinfo
 .Op Fl M , -mount
 .Op Fl R , -remount
@@ -486,6 +487,7 @@ remounted.
 .Pp
 The -q option suppresses all informational output. If it is specified
 twice, all error messages are suppressed as well.
+.It Xo
 .Ic mountinfo
 .Op Fl f, -fstype-regex Ar regex
 .Op Fl F, -skip-fstype-regex Ar regex