Merge pull request #320 from splunk/readme_change

Update readme.md file

Author: chaitanyaphalak

README.md

@@ -192,7 +192,7 @@ Use the below schema to configure Splunk Connect for Kafka
 | Name              | Description                | Default Value  |
 |--------           |----------------------------|-----------------------|
 | `splunk.header.support` |   When set to `true` Splunk Connect for Kafka will parse Kafka headers for use as meta data in Splunk events. Valid settings are `true` or `false`. | `false` |
-| `splunk.header.custom` | Custom headers are configured separated by comma for multiple headers. ex,  "custom_header_1,custom_header_2,custom_header_3". This setting will look for kafka record headers with these values and add them to each event if present. This setting is only applicable when `splunk.header.support` is set to `true`. | `""` |
+| `splunk.header.custom` | Custom headers are configured separated by comma for multiple headers. ex,  "custom_header_1,custom_header_2,custom_header_3". This setting will look for kafka record headers with these values and add them to each event if present. This setting is only applicable when `splunk.header.support` is set to `true`. <br/> **NOTE:** <br/> Only applicable to /event HEC endpoint. | `""` |
 | `splunk.header.index` | This setting specifies the Kafka record header key which will determine the destination index for the Splunk event. This setting is only applicable when `splunk.header.support` is set to `true`. | `splunk.header.index` |
 | `splunk.header.source` | This setting specifies the Kafka record header key which will determine the source value for the Splunk event. This setting is only applicable when `splunk.header.support` is set to `true`. | `splunk.header.source` |
 | `splunk.header.sourcetype` | This setting specifies the Kafka record header key which will determine the sourcetype value for the Splunk event. This setting is only applicable when `splunk.header.support` is set to `true`. | `splunk.header.sourcetype` |