add to News.md about defining keys on RegexMatch

fix whitespace

Author: oxinabox

NEWS.md

@@ -117,6 +117,7 @@ Standard library changes
 * The `Pkg.Artifacts` module has been imported as a separate standard library.  It is still available as
   `Pkg.Artifacts`, however starting from Julia v1.6+, packages may import simply `Artifacts` without importing
   all of `Pkg` alongside. ([#37320])
+* `keys(::RegexMatch)` is now defined to return the captures keys, by name if named, or by index if not ([#37299]).
 
 #### LinearAlgebra