Delete leftover examples about the fluentd sumologic output

Fixes #287

Author: fekete-robert

content/docs/configuration/plugins/_index.md

@@ -23,7 +23,6 @@ For more information please click on the plugin name
 | **[Record Modifier](filters/record_modifier/)** | filters | Modify each event record. | GA | [2.1.0](https://github.com/repeatedly/fluent-plugin-record-modifier) |
 | **[Record Transformer](filters/record_transformer/)** | filters | Mutates/transforms incoming event streams. | GA | [more info](https://docs.fluentd.org/filter/record_transformer) |
 | **[Stdout](filters/stdout/)** | filters | Prints events to stdout | GA | [more info](https://docs.fluentd.org/filter/stdout) |
-| **[SumoLogic](filters/sumologic/)** | filters | Sumo Logic collection solution for Kubernetes | GA | [2.3.1](https://github.com/SumoLogic/sumologic-kubernetes-collection) |
 | **[Tag Normaliser](filters/tagnormaliser/)** | filters | Re-tag based on log metadata | GA | [0.1.1](https://github.com/banzaicloud/fluent-plugin-tag-normaliser) |
 | **[Throttle](filters/throttle/)** | filters | A sentry plugin to throttle logs. Logs are grouped by a configurable key. When a group exceeds a configuration rate, logs are dropped for this group. | GA | [0.0.5](https://github.com/rubrikinc/fluent-plugin-throttle) |
 | **[Amazon Elasticsearch](outputs/aws_elasticsearch/)** | outputs | Fluent plugin for Amazon Elasticsearch | Testing | [2.4.1](https://github.com/atomita/fluent-plugin-aws-elasticsearch-service) |
@@ -52,7 +51,6 @@ For more information please click on the plugin name
 | **[Amazon S3](outputs/s3/)** | outputs | Store logs in Amazon S3 | GA | [1.6.1](https://github.com/fluent/fluent-plugin-s3/releases/tag/v1.6.1) |
 | **[Splunk Hec](outputs/splunk_hec/)** | outputs | Fluent Plugin Splunk Hec Release | GA | [1.2.9]() |
 | **[SQS](outputs/sqs/)** | outputs | Output plugin writes fluent-events as queue messages to Amazon SQS | Testing | [v2.1.0](https://github.com/ixixi/fluent-plugin-sqs) |
-| **[SumoLogic](outputs/sumologic/)** | outputs | Send your logs to Sumologic | GA | [1.8.0](https://github.com/SumoLogic/fluentd-output-sumologic/releases/tag/1.8.0) |
 | **[Syslog](outputs/syslog/)** | outputs | Output plugin writes events to syslog | GA | [0.9.0.rc.8](https://github.com/cloudfoundry/fluent-plugin-syslog_rfc5424) |
 </center>