NEWS/README: Add missing change documentation for 5.9

This covers the following changes:

users/24971: ${(-)var} sorts on signed integers

47704: POSIX export and readonly ignore "-p" when parameter names also appear

47913: implement CASE_PATHS option to make NO_CASE_GLOB more sensible

48073: Add fc -s as POSIX way of rerunning command without starting editor

49307 with doc update: POSIX_TRAPS fix.

49528: allow multiple -D options to compadd

49534, 49539: separate watch/log functionality out into a module

49561: add zformat -F option, similar to -f but ternary expressions check for
existence instead of doing math evaluation

49597: add a helper for completing numbers with unit suffixes and separate out
defaults, ranges and units in completion descriptions

49611 based on 49590 (Martijn Dekker): disable Inf and NaN in math expressions
for sh emulation

49646: allow colors in WATCHFMT with %F/%K

49694 + doc: Allow using empty STTY= to freeze tty for a single command

49853 + 49882/49883: make "${arr[*]:off}" compatible with ksh/bash

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