doc/{dlb,recover}.6: Disable dead dynamic code

Portions of these man pages seem at one time to have been dynamically
selected, but the mechanism for doing so appears to be commented out in
the source tree: see "NHGREP" in sys/{unix,vms}/Makefile.doc.

Wrap them in *roff "ignore blocks" to keep their noise from cluttering
the man page actually seen by the users.

doc/dlb.6

@@ -40,6 +40,7 @@ archive files from which NetHack reads special level files and other
 read-only information.  Note that like tar the command and option
 specifiers are specified as a continuous string and are followed
 by any arguments required in the same order as the option specifiers.
+.ig
 .PP
 ^?ALLDOCS
 This facility is optional and may be excluded during NetHack
@@ -53,6 +54,7 @@ This facility is optional and was excluded from this NetHack
 configuration.
 ^.
 ^.
+..
 .SH COMMANDS
 The
 .B x