fix(docs): Replace hard tabs with spaces

docs/KnownIssues.md

@@ -34,9 +34,9 @@ the collector will fail to start on next run.
 The error message is similar to the below:
 
 ```console
-2021-08-24T10:52:38.639Z	error	sumologicextension@v0.31.0/extension.go:373	Heartbeat error	{"kind": "extension", "name": "sumologic", "collector_name": "<your-collector-name>", "collector_id": "0000000001A2B3C4", "error": "collector heartbeat request failed, status code: 401, body: {\n\"servlet\":\"rest\",\n\"message\":\"Could not authenticate.\",\n\"url\":\"/api/v1/collector/heartbeat\",\n\"status\":\"401\"\n}"}
+2021-08-24T10:52:38.639Z  error  sumologicextension@v0.31.0/extension.go:373  Heartbeat error  {"kind": "extension", "name": "sumologic", "collector_name": "<your-collector-name>", "collector_id": "0000000001A2B3C4", "error": "collector heartbeat request failed, status code: 401, body: {\n\"servlet\":\"rest\",\n\"message\":\"Could not authenticate.\",\n\"url\":\"/api/v1/collector/heartbeat\",\n\"status\":\"401\"\n}"}
 github.com/open-telemetry/opentelemetry-collector-contrib/extension/sumologicextension.(*SumologicExtension).heartbeatLoop
-	github.com/open-telemetry/opentelemetry-collector-contrib/extension/sumologicextension@v0.31.0/extension.go:373
+  github.com/open-telemetry/opentelemetry-collector-contrib/extension/sumologicextension@v0.31.0/extension.go:373
 ```
 
 To work around this, delete the local collector registration file at `~/.sumologic-otel-collector/`.