Correct the #sig-docs URL

Signed-off-by: PingWang <[email protected]>

content/en/docs/contribute/start.md

@@ -50,7 +50,7 @@ The SIG Docs community created guidelines about what kind of content is allowed
 in the Kubernetes documentation. Look over the [Documentation Content 
 Guide](/docs/contribute/style/content-guide/) to determine if the content 
 contribution you want to make is allowed. You can ask questions about allowed 
-content in the [#sig-docs]((#participate-in-sig-docs-discussions)) Slack 
+content in the [#sig-docs](#participate-in-sig-docs-discussions) Slack
 channel.
 
 ### Style guidelines