[O] agenda does not restrict to file

[Samuel Wales]

There are 3 categories of Org files: org-agenda-files,
org-agenda-text-search-extra-files, and other files.

An agenda text search without restriction will search in the first two
categories.

A search with restriction to a member of other files will search that
file (good and expected) and also org-agenda-text-search-extra-files
(might or might not be good but was not expected).

Might be worth documenting how to restrict without also searching
org-agenda-text-search-extra-files?

Samuel

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