Manual: Improve phrasing for @extended in FileFindNext

[hifi55]

​https://www.autoitscript.com/autoit3/docs/functions/FileFindNextFile.htm
reads for flags:

0 = (default) use @extended to return 1 or 0 if search item is a directory.

To me that is unclear and had to dig deeply into my stubborn script to iron it out. It looks as if 1 will be returned by default, but 0 if the search is a directory. However, it returns 1 if the search item is a directory...

Please rephrase this for improved clearity to something like

0 = (default) use @extended to return 1 if the item is a directory, 0 if it's not

[J-Paul Mesnage]

Fixed by revision [13166] in version: 3.3.19.0