minor convert-ly problem

[Keith OHara]

Carl,
  The commands to adjust automatic beaming changed at 2.13.4 and again at 
2.13.29, with NOT_SMART conversion rules.  Only the first rule is triggered on 
scores for the last stable version, and it refers to commands in the 2.13.4 
manual that users will not have.

  It seems appropriate to re-write the 2.13.4 rule to refer to the newest commands so 
users can find them in the release-version manual. I could try to write a patch but don't 
yet know what commands correspond to what old commands. (And, in this case, maybe you 
want to say "look at the default output first, and if adjustments are still needed, 
update manually.")

  I did not see any other cases of this effect within this release cycle, but 
we have a nice mnemonic for next time:
Two NOT_SMARTs do not make a SMART.

-Keith