Fixed typo in changelog

doc/changelog.doc

@@ -6,7 +6,7 @@
 \htmlonly
 <b>(release date 24-12-2013)</b>
 <a name="1.8.6"></a>
-<h3>Bug fixes (ids refer to the <a href="http://bugzilla.gnome.org/buglist.cgi?product=doxygen&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=NEEDINFO&bug_status=REOPENED&bug_status=RESOLVED&bug_status=VERIFIED&bug_status=CLOSED&email1=&emailtype1=substring&emailassigned_to1=1&email2=&emailtype2=substring&emailreporter2=1&changedin=&chfieldfrom=&chfieldto=Now&chfieldvalue=&short_desc=&short_desc_type=substring&long_desc=&long_desc_type=substring&bug_file_loc=&bug_file_loc_type=substring&status_whiteboard=&status_whiteboard_type=substring&keywords=&keywords_type=anywords&op_sys_details=&op_sys_details_type=substring&version_details=&version_details_type=substring&newqueryname=&form_name=query&order=bugs.bug_id">bugzilla</a> database, lines with bug refer to commit is <a href="https://github.com/doxygen/doxygen/commits/master">GitHub</a>)</h3>
+<h3>Bug fixes (ids refer to the <a href="http://bugzilla.gnome.org/buglist.cgi?product=doxygen&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=NEEDINFO&bug_status=REOPENED&bug_status=RESOLVED&bug_status=VERIFIED&bug_status=CLOSED&email1=&emailtype1=substring&emailassigned_to1=1&email2=&emailtype2=substring&emailreporter2=1&changedin=&chfieldfrom=&chfieldto=Now&chfieldvalue=&short_desc=&short_desc_type=substring&long_desc=&long_desc_type=substring&bug_file_loc=&bug_file_loc_type=substring&status_whiteboard=&status_whiteboard_type=substring&keywords=&keywords_type=anywords&op_sys_details=&op_sys_details_type=substring&version_details=&version_details_type=substring&newqueryname=&form_name=query&order=bugs.bug_id">bugzilla</a> database, lines without bug id refer to commits in <a href="https://github.com/doxygen/doxygen/commits/master">GitHub</a>)</h3>
 <ul>
 <li> Bug 154880 - if "using namespace" used, call of a static member function in C++ is not recognized or recognized wrong
 <li> Bug 647517  - make install prepends a slash to the installation path Removed superfluous /