Rename project name to 'PaddlePaddle'

ISSUE=4606627


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1454 1ad973e4-5ce8-4261-8a94-b56d1f490c56

doc_cn/conf.py.in

@@ -26,7 +26,7 @@ sys.path.insert(0, '@PROJ_ROOT@/python')
 # -- General configuration ------------------------------------------------
 
 # General information about the project.
-project = u'PADDLE'
+project = u'PaddlePaddle'
 author = u'%s developers' % project
 copyright = u'2016, %s' % author
 github_doc_root = ''

doc_cn/index.md

-Paddle文档
+PaddlePaddle文档
 ===================
 
 * [快速入门](demo/quick_start/index.md)