[fs.class.directory.entry.general] Remove superfluous "unneeded" (#7245)

Author: frederick-vs-ja

source/iostreams.tex

@@ -16117,7 +16117,7 @@
 \tcode{directory_iterator} can cache
 already available attribute values
 directly into a \tcode{directory_entry} object
-without the cost of an unneeded call to \tcode{refresh()}.
+without the cost of a call to \tcode{refresh()}.
 \end{note}
 
 \pnum