cleanup github issues

Author: dbu

.github/Documentation_issue.md

@@ -5,6 +5,6 @@ about: Anything related to Symfony CMF Documentation
 ---
 
 Symfony CMF Documentation has its own dedicated repository. Please open your
-documentation-related issue at https://github.com/symfony-cmf/symfony-cmf-docs/issues
+documentation-related issue at https://github.com/symfony-cmf/routing-docs/issues
 
 Thanks!

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 | Q             | A
 | ------------- | ---
-| Branch?       | "master" for new features / the branch of the current release for fixes
+| Branch?       | default branch for new features / the branch of the current release for fixes
 | Bug fix?      | yes/no
 | New feature?  | yes/no
 | BC breaks?    | yes/no

.github/Security_issue.md

@@ -5,5 +5,5 @@ about: Report security-related errors
 ---
 
 If you have found a security issue in Symfony, please send the details to
-[David](mailto:david@liip.ch) or [Maximilian](mailto:maximilian.berghoff@gmx.de) and don't disclose it publicly until we can provide a
+[David](mailto:david@liip.ch) or and don't disclose it publicly until we can provide a
 fix for it.