Fix whitespace in changelog

pkgs/markdown/CHANGELOG.md

diff --git a/pkgs/markdown/CHANGELOG.md b/pkgs/markdown/CHANGELOG.md
index 1217d79..65b05b5 100644
--- a/pkgs/markdown/CHANGELOG.md
+++ b/pkgs/markdown/CHANGELOG.md
@@ -12,7 +12,8 @@
   SetextHeaderWithIdSyntax extensions.
 * Implement backslash-escaping so that Markdown syntax can be escaped, such as
   `[foo]\(bar) ==> <p>[foo](bar)</p>`.
-* Support for hard line breaks with either `\\\n` or `  \n` (#30, #60).
+* Support for hard line breaks with either `\\\n` or <code>  \n</code> (#30,
+  #60).
 * New public method for BlockParser: `peek(int linesAhead)`, meant for use in
   subclasses.
 * New public members for ListSyntax: `blocksInList` and `determineBlockItems()`,