src+docs: Clarifying README and remove unused option from usage

Refs: #1827

Change-Id: I171d7316548c0a94a81d9e8bdb73f6cdfc5f39f1
diff --git a/nlsr.conf b/nlsr.conf
index 13d7b5b..948c67a 100644
--- a/nlsr.conf
+++ b/nlsr.conf
@@ -23,7 +23,7 @@
 
 neighbors
 {
-; in case hello interest timed out, router will try 'hello-retries' times at 'hello-time-out'
+; in case hello interest timed out, router will try 'hello-retries' times at 'hello-timeout'
 ; seconds interval before giving up for any neighbors (deciding link is down)
 
    hello-retries 3                     ; interest retries number in integer. Default value 3