Update NEWS.md (JuliaLang#17562)

* Update NEWS.md

A few changes to mollify the OCD of the one who opened issue JuliaLang#17478...

* Update NEWS.md

Added some spaces. Perhaps I shouldn't have edited it in a browser window...

* Update NEWS.md

finally found the space

NEWS.md

@@ -257,6 +257,22 @@ Library improvements
  * `Date` and `DateTime` values can now be rounded to a specified resolution (e.g., 1 month or
  15 minutes) with `floor`, `ceil`, and `round` ([#17037]).
 
+ * File handling:
+
+ * A new function `walkdir()` returns an iterator that walks the directory tree of a directory. ([#1765])
+
+ ```
+ for (root, dirs, files) in walkdir(expanduser("~/.julia/v0.5/Plots/src"))
+ println("$(length(files)) \t files in $root")
+ end
+ 19 files in /Users/me/.julia/v0.5/Plots/src
+ 15 files in /Users/me/.julia/v0.5/Plots/src/backends
+ 4 files in /Users/me/.julia/v0.5/Plots/src/deprecated
+ ```
+
+ * A new function `chown()` changes the ownership of files. ([#15007])
+
+
 Deprecated or removed
 ---------------------