session CHANGE new timeout introduced

Also described with other options in README.
diff --git a/src/netconf.h b/src/netconf.h
index 1221b08..aea5dbd 100644
--- a/src/netconf.h
+++ b/src/netconf.h
@@ -35,7 +35,7 @@
 #define NC_PORT_CH_TLS 4335
 
 /** @brief Microseconds after which tasks are repeated until the full timeout elapses.
- *         A second (1000 000) should be divisible by this number without remain.
+ *         A millisecond (1000) should be divisible by this number without remain.
  */
 #define NC_TIMEOUT_STEP 20