fix docs: update check cmd flags docs

Author: FUSAKLA

CHANGELOG.md

@@ -12,7 +12,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 ## Unreleased.
 
 ### Added
- 
+
 - [#1097](https://github.com/improbable-eng/thanos/pull/1097) Added `thanos check rules` linter for Thanos rule rules files.
 
 ## [v0.5.0](https://github.com/improbable-eng/thanos/releases/tag/v0.5.0) - 2019.06.05

docs/components/check.md

@@ -23,14 +23,12 @@ Flags:
       --version            Show application version.
       --log.level=info     Log filtering level.
       --log.format=logfmt  Log format to use.
-      --gcloudtrace.project=GCLOUDTRACE.PROJECT
-                           GCP project to send Google Cloud Trace tracings to.
-                           If empty, tracing will be disabled.
-      --gcloudtrace.sample-factor=1
-                           How often we send traces (1/<sample-factor>). If 0 no
-                           trace will be sent periodically, unless forced by
-                           baggage item. See `pkg/tracing/tracing.go` for
-                           details.
+      --tracing.config-file=<tracing.config-yaml-path>
+                           Path to YAML file that contains tracing
+                           configuration.
+      --tracing.config=<tracing.config-yaml>
+                           Alternative to 'tracing.config-file' flag. Tracing
+                           configuration in YAML.
 
 Subcommands:
   check rules <rule-files>...
@@ -67,14 +65,12 @@ Flags:
       --version            Show application version.
       --log.level=info     Log filtering level.
       --log.format=logfmt  Log format to use.
-      --gcloudtrace.project=GCLOUDTRACE.PROJECT
-                           GCP project to send Google Cloud Trace tracings to.
-                           If empty, tracing will be disabled.
-      --gcloudtrace.sample-factor=1
-                           How often we send traces (1/<sample-factor>). If 0 no
-                           trace will be sent periodically, unless forced by
-                           baggage item. See `pkg/tracing/tracing.go` for
-                           details.
+      --tracing.config-file=<tracing.config-yaml-path>
+                           Path to YAML file that contains tracing
+                           configuration.
+      --tracing.config=<tracing.config-yaml>
+                           Alternative to 'tracing.config-file' flag. Tracing
+                           configuration in YAML.
 
 Args:
   <rule-files>  The rule files to check.