docs: Follow-up to last: Fix markup.

docs/highlighters.md

@@ -29,7 +29,7 @@ the syntax for values is the same as the syntax of "types of highlighting" of
 the zsh builtin `$zle_highlight` array, which is documented in [the `zshzle(1)`
 manual page][zshzle-Character-Highlighting].
 
-[zshzle-Character-Highlighters]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
+[zshzle-Character-Highlighting]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
 
 Some highlighters support additional configuration parameters; see each
 highlighter's documentation for details.