Set up *roff hyphenation more carefully.

* doc/Guidebook.mn: Remove workaround, in favor of...
* doc/tmac.n: ...setting automatic hyphenation mode appropriate to
  hyphenation systems used by AT&T-descended troffs on the one hand
  ("suftab") and groff (TeX hyphenation patterns) on the other.

modify results of pull request #977 to target tmac.nh instead.

Guidebook update to trigger the process following pull request 977.

doc/Guidebook.mn

@@ -37,7 +37,7 @@
 .ds f0 "\*(vr
 .ds f1
 .\"DO NOT REMOVE NH_DATESUB .ds f2 "DATE(%B %-d, %Y)
-.ds f2 "February 07, 2023
+.ds f2 "February 09, 2023
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
@@ -2974,13 +2974,11 @@ have a limited number of uses, akin to wand charges.  For example, lamps burn
 out after a while.  Other tools are containers, which objects can
 be placed into or taken out of.
 .pg
-.hy 0
 Some tools (such as a blindfold) can be \fIworn\fP and can be put on and
 removed like other accessories (rings, amulets); see \fIAmulets\fP.
 Other tools (such as pick-axe) can be wielded as weapons in addition to
 being applied for their usual purpose, and in some cases (again, pick-axe)
 become wielded as a weapon even when applied.
-.hy 2
 .pg
 .\" Mentioned here because of the old method of attempting "Zen" conduct:
 .\" restart until there's a blindfold in starting inventory and put it on