debian/changelog: white-space and format fixes.

debian/changelog

 freerdp (1.1.0~git20140921.1.440916e+dfsg1-14) UNRELEASED; urgency=high
 
   [ Bernhard Miklautz ]
-  * debian/patches 
+  * debian/patches:
    + Add fix for CVE-2017-2834, CVE-2017-2835, CVE-2017-2836,
-     CVE-2017-2837, CVE-2017-2838, CVE-2017-2839 (Closes: #869880)
+     CVE-2017-2837, CVE-2017-2838, CVE-2017-2839. (Closes: #869880).
 
  -- Bernhard Miklautz <bernhard.miklautz@shacknet.at>  Thu, 27 Jul 2017 13:47:59 +0200