Update README; tweak header name

Author: git-babel

README.md

@@ -435,7 +435,7 @@ Information relating the end result of a call can be obtained at any time via th
 |ACCEPT_FAILED | The accept() method call has failed.|
 |OTHER_DEVICE_ACCEPTED | The incoming call was accepted on a different device. This device received an incoming call notification, but the call ended when a different device accepted it.|
 
-## Encoding Specs
+## Encoding Configurations
 
 | Category           | Value  | Note                     |
 |--------------------|--------|--------------------------|