[css-text-3] Update DoC

Author: fantasai

css-text/issues-lc-2013.txt

@@ -796,7 +796,7 @@ Closed:   Accepted
 Resolved: https://lists.w3.org/Archives/Public/www-style/2015Sep/0165.html
 ----
 Issue 91.
-Summary:  Better definition for 'pre-wrap'
+Summary:  Better definition for 'pre-wrap' trailing spaces that don't fit
 From:     Florian Rivoal
 Closed:   Accepted
 Resolved: Sydney F2F 2016