Update the appropriate historical NEWS files with time-stamp feature
releases. Suggested by Stefan Monnier. All dates are from my notes.
* etc/symbol-releases.eld: Remove time-stamp,
reverting commit 69210eb84e of 17 March.
* etc/NEWS.19:
* etc/NEWS.20: Add 'time-stamp' feature paragraphs that
should have been written then.
* etc/NEWS.21: Add missing quotes, so symbol names can be identified.
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