Building .info from multiple .texi files via % wildcard

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I have scrutinised the Emacs Makefile.in (located in doc/emacs).

EMACSSOURCES specifies a list of .texi source files.  The implication
is that the Emacs manual is a single Info file built from many source=20
files, so rule like the below would not work.

$(trgdir)/%.info: $(srcdir)/%.texi

Is the statement correct.  I have been under the conviction that
%.texi processes all .texi files present in the sources directory.