Fix typo in config documentation

Change-Id: I3c19df5ea443546983676f83466648193edabd35

README.md

diff --git a/README.md b/README.md
index bd49524..464eb52 100644
--- a/README.md
+++ b/README.md
@@ -131,7 +131,7 @@
 
 ```
 [healtcheck]
-  failFileFlaPath="data/healthcheck/fail"
+  failFileFlagPath="data/healthcheck/fail"
 ```
 
 This will make the healthcheck endpoint return 500 even if the node is otherwise