Documentation: use paths relative to document root in links.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170027 91177308-0d34-0410-b5e6-96231b3b80d8

docs/CommandGuide/llvm-bcanalyzer.rst

@@ -301,5 +301,5 @@ The detailed output provides additional information on a per-function basis.
 SEE ALSO
 --------
 
-:doc:`../CommandGuide/llvm-dis`, :doc:`../BitCodeFormat`
+:doc:`/CommandGuide/llvm-dis`, :doc:`/BitCodeFormat`