Add #11583 description on docs/source/whatsnew/pr

docs/source/whatsnew/pr/unicode-name-completions.rst

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+Unicode Name Completions
+========================
+
+The #11583 Pull Request provides IPython a new feature. 
+
+Previously, we provided completion for a unicode name with its relative symbol.
+With this, now IPython provides complete suggestions to unicode name symbols. 
+
+As on the PR, if user types '\LAT<tab>', IPython provides a list of 
+possible completions. In this case, it would be something like:
+
+('LAT',
+ ['LATIN CAPITAL LETTER A',
+  'LATIN CAPITAL LETTER B',
+  'LATIN CAPITAL LETTER C',
+  'LATIN CAPITAL LETTER D',
+....
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