Fix broken named-chunk haddock reference

And rewrap/wiggle the Haddock markup while at it.

This is a follow-up to
c91deda

Author: hvr

Data/Text.hs

@@ -251,16 +251,17 @@ import qualified GHC.Exts as Exts
 import Text.Printf (PrintfArg, formatArg, formatString)
 #endif
 
--- $character-definition
+-- $character_definition
 --
--- This package uses the word /character/ to denote Unicode code points.
+-- This package uses the term /character/ to denote Unicode /code points/.
 --
--- Note that this is not the same thing as a grapheme (e.g. a composition of
--- code points that form one visual symbol). For instance, consider the grapheme
--- @ä@. This symbol has two Unicode representations: a single code-point
--- representation @U+00E4@ (the @LATIN SMALL LETTER A WITH DIAERESIS@ code
--- point), and a two code point representation @U+0061@ (the @A@ code point) and
--- @U+0308@ (the @COMBINING DIAERESIS@ code point).
+-- Note that this is not the same thing as a grapheme (e.g. a
+-- composition of code points that form one visual symbol). For
+-- instance, consider the grapheme \"ä\". This symbol has two
+-- Unicode representations: a single code-point representation
+-- @U+00E4@ (the @LATIN SMALL LETTER A WITH DIAERESIS@ code point),
+-- and a two code point representation @U+0061@ (the \"@A@\" code
+-- point) and @U+0308@ (the @COMBINING DIAERESIS@ code point).
 
 -- $strict
 --