Fix comment (#12919)

Author: trask

specification/applicationinsights/data-plane/Monitor.Exporters/preview/2020-09-15_Preview/swagger.json

@@ -856,7 +856,7 @@
           "type": "number",
           "format": "float",
           "default": 100.0,
-          "description": "Sampling rate used in application. This telemetry item represents 1 / sampleRate actual telemetry items."
+          "description": "Sampling rate used in application. This telemetry item represents 100 / sampleRate actual telemetry items."
         },
         "seq": {
           "type": "string",