Transient manual

[Po Lu]

The recently imported Transient manual fails to compile as part of
Emacs, because it relies on features absent from Texinfo 4.13.  For
example, it presumes that Makeinfo is capable of extrapolating the Up
fields of each node on the basis of an implicitly generated menu.

There are some other difficulties I spotted, such as the use of Unicode
quotes rather than `` and '', and so on.

I will fix these issues on master, but would the Transient developers
take care to avoid these pitfalls in the future?  There are several
machines I use for Emacs development where anything newer than Texinfo
4.13 is unobtanium, consequent of difficulties with their Perl
installations.