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/recover.6

@@ -48,6 +48,7 @@ supplies a directory which is the NetHack playground.
 It overrides the value from NETHACKDIR, HACKDIR, or the directory
 specified by the game administrator during compilation
 (usually /usr/games/lib/nethackdir).
+.ig
 .PP
 ^?ALLDOCS
 For recovery to be possible,
@@ -69,6 +70,7 @@ This configuration of
 was created without support for recovery.
 ^.
 ^.
+..
 NetHack normally writes out files for levels as the player leaves them,
 so they will be ready for return visits.
 When checkpointing, NetHack also writes out the level entered and