[DOCS] Fix formatting error in Slack action
@@ -169,9 +169,9 @@ aggregation and the Slack action:
more information, see
<<slack-dynamic-attachment, Using Attachments to Format Slack Messages>>.
-| `proxy.host` | no | - | The proxy host to use (only in combination with `proxy.port`)
+| `proxy.host` | no | The proxy host to use (only in combination with `proxy.port`)
-| `proxy.port` | no | - | The proxy port to use (only in combination with `proxy.host`)
+| `proxy.port` | no | The proxy port to use (only in combination with `proxy.host`)
|======
[[configuring-slack]]
