Fix an small typo in the documentation (microsoft#497)

* Fixed typo in silent parameter

* Fix typo

Fixed an small typo

Author: judavi

node/docs/azure-pipelines-task-lib.json

@@ -35,7 +35,7 @@
               "return": "{ [key: string]: string; }"
             },
             "silent": {
-              "documentation": "optional.  defaults to fales ",
+              "documentation": "optional.  defaults to false ",
               "name": "silent",
               "return": "boolean"
             },
@@ -2489,4 +2489,4 @@
       }
     }
   }
-}
+}

node/toolrunner.ts

@@ -29,7 +29,7 @@ export interface IExecSyncOptions {
     /** optional envvar dictionary.  defaults to current process's env */
     env: { [key: string]: string };
 
-    /** optional.  defaults to fales */
+    /** optional.  defaults to false */
     silent: boolean;
 
     outStream: stream.Writable;