CONTRIBUTING.md: Update documentation links

Signed-off-by: Ted Hess <thess@kitschensync.net>

CONTRIBUTING.md

@@ -1,5 +1,5 @@
 # Contributing Guidelines  
-(See <http://wiki.openwrt.org/doc/devel/packages> for overall format and construction)
+Ref: <https://openwrt.org/docs/guide-developer/packages> for overall format and construction
 
 
 ### Basic guidelines
@@ -41,8 +41,8 @@ All packages you commit or submit by pull-request should follow these simple gui
 
 * Have a useful description prefixed with the package name
     (E.g.: "foopkg: Add libzot dependency")
-* Include Signed-off-by in the comment
-    (See <https://dev.openwrt.org/wiki/SubmittingPatches#a10.Signyourwork>)
+* Include Signed-off-by tag in the commit comments.
+    See: [Sign your work](https://openwrt.org/docs/guide-developer/submittingpatches-tomerge?s[]=sign#sign_your_work)
 
 ### Advice on pull requests: