(AzureCXP) fixes MicrosoftDocs/azure-docs#288381

Updated line no:433 from "It will not trigger again if there is an outstanding invocation is still running" to "It will not trigger again if there is an outstanding invocation still running"

Author: PesalaPavan

articles/azure-functions/functions-bindings-timer.md

@@ -430,7 +430,7 @@ Expressed as a string, the `TimeSpan` format is `hh:mm:ss` when `hh` is less tha
 
 ### Scale-out
 
-If a function app scales out to multiple instances, only a single instance of a timer-triggered function is run across all instances. It will not trigger again if there is an outstanding invocation is still running.
+If a function app scales out to multiple instances, only a single instance of a timer-triggered function is run across all instances. It will not trigger again if there is an outstanding invocation still running.
 
 ### Function apps sharing Storage