logrotate: add some comments

src/logrotate.ejs

@@ -8,6 +8,7 @@
     maxsize 1M
     missingok
     delaycompress
+    # this truncates the original log file and not the rotated one
     copytruncate
 }
 
@@ -18,6 +19,7 @@
     missingok
     # we never compress so we can simply tail the files
     nocompress
+    # this truncates the original log file and not the rotated one
     copytruncate
 }