set better example values for unicorn stdout/stderr log settings

[ci skip]

closes #8058

Changelog.md

 # 0.7.13.0
 
 ## Refactor
+* Set better example values for unicorn stdout/stderr log settings [#8058](https://github.com/diaspora/diaspora/pull/8058)
 
 ## Bug fixes
 * Fix error while trying to fetch some sites with invalid OpenGraph data [#8049](https://github.com/diaspora/diaspora/pull/8049)

config/diaspora.yml.example

@@ -186,8 +186,8 @@ configuration: ## Section
     #rails_environment: 'development'
 
     ## Write unicorn stderr and stdout log.
-    #stderr_log: '/usr/local/app/diaspora/log/unicorn-stderr.log'
-    #stdout_log: '/usr/local/app/diaspora/log/unicorn-stdout.log'
+    #stderr_log: 'log/unicorn-stderr.log'
+    #stdout_log: 'log/unicorn-stdout.log'
 
     ## Number of Unicorn worker processes (default=2).
     ## Increase this if you have many users.