bug#39290: [PATCH] Correct regexp for flags in 'format' doc string

[Mattias Engdegård]

The doc string for 'format' contains

  where field is [0-9]+ followed by a literal dollar "$", flags is
  [+ #-0]+, width is [0-9]+, and precision is a literal period "."
  followed by [0-9]+.

The spec for flags isn't a correct regexp; the hyphen should be last.  This 
matters, because people copy it into their code without thinking (observed in 
the wild).

Patch acceptable for emacs-27?

0001-Correct-regexp-for-flags-in-format-doc-string.patch
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