Fix obsoleted proposals document link

Closes #1531 

Reviewers: Sijie Guo <sijie@apache.org>

This closes #1959 from liketic/fix-link

Author: Like

site/community/contributing.md

@@ -54,7 +54,7 @@ Slack channels are great for quick questions or discussions on specialized topic
 
 To avoid potential frustration during the code review cycle, we encourage you to clearly scope and design non-trivial contributions with the BookKeeper community before you start coding.
 
-We are using [BookKeeper Proposals](https://cwiki.apache.org/confluence/display/BOOKKEEPER/BookKeeper+Proposals) for managing major changes to BookKeeper.
+We are using [BookKeeper Proposals](http://bookkeeper.apache.org/community/bookkeeper_proposals/) for managing major changes to BookKeeper.
 
 ## Code
 

site/community/issue-report.md

@@ -28,7 +28,7 @@ Here is an very useful artical [How to report bugs effectively]( http://www.chia
 -  Please describe the feature you are requesting.
 -  Indicate the importance of this issue to you (_blocker_, _must-have_, _should-have_, _nice-to-have_). Are you currently using any workarounds to address this issue?
 -  Provide any additional detail on your proposed use case for this feature.
--  If it is a [BookKeeper Proposal](https://cwiki.apache.org/confluence/display/BOOKKEEPER/BookKeeper+Proposals), please label this issue as `BP`.
+-  If it is a [BookKeeper Proposal](http://bookkeeper.apache.org/community/bookkeeper_proposals/), please label this issue as `BP`.
 
 #### If it is a **BUG REPORT**
 

site/community/meeting.md

@@ -6,7 +6,7 @@ The community meeting runs bi-weekly on Thursday 8am - 9am PST. The meeting link
 
 The meeting is typically comprised of 3 parts:
 
-- Discuss [BookKeeper Proposals](https://cwiki.apache.org/confluence/display/BOOKKEEPER/BookKeeper+Proposals).
+- Discuss [BookKeeper Proposals](http://bookkeeper.apache.org/community/bookkeeper_proposals/).
 - Review and address concerns for any open pull requests.
 - Open discussion.
 

site/community/releases.md

@@ -7,7 +7,7 @@ title: Release Management
 Apache BookKeeper community makes a feture release every 3 month.
 
 - A month before the release date, the release manager will cut branches and also publish a list of features that will be included in the release. These features will typically
-    be [BookKeeper Proposals](https://cwiki.apache.org/confluence/display/BOOKKEEPER/BookKeeper+Proposals), but not always.
+    be [BookKeeper Proposals](http://bookkeeper.apache.org/community/bookkeeper_proposals/), but not always.
 - Another week will be left for *minor* features to get in, but at this point the community will start efforts to stabilize the release branch and contribute mostly tests and fixes.
 - Two weeks before the release date, the bookkeeper community will announce code-freeze and start rolling out release candidates, after which only fixes for blocking bugs will be merged.