doc: Flags and labels are case insensitive.

docs/content/operations/cli.md

@@ -26,6 +26,8 @@ traefik [--flag=flag_argument] [-f [flag_argument]]
 traefik [--flag[=true|false| ]] [-f [true|false| ]]
 ```
 
+!!! info "Flags are case insensitive."
+
 ### `healthcheck`
 
 Calls Traefik `/ping` to check the health of Traefik.

docs/content/providers/docker.md

@@ -541,6 +541,11 @@ providers:
 
 ## Routing Configuration Options
 
+!!! note "Labels"
+    
+    - Labels are case insensitive.
+    - The complete list of labels can be found [the reference page](../reference/dynamic-configuration/docker.md)
+
 ### General
 
 Traefik creates, for each container, a corresponding [service](../routing/services/index.md) and [router](../routing/routers/index.md).

docs/content/providers/marathon.md

@@ -592,6 +592,11 @@ Enables watching for Marathon changes.
 
 ## Routing Configuration Options
 
+!!! note "Labels"
+    
+    - Labels are case insensitive.
+    - The complete list of labels can be found [the reference page](../reference/dynamic-configuration/marathon.md)
+
 ### General
 
 Traefik creates, for each Marathon application, a corresponding [service](../routing/services/index.md) and [router](../routing/routers/index.md).

docs/content/providers/rancher.md

@@ -277,6 +277,11 @@ See also [Restrict the Scope of Service Discovery](./overview.md#restrict-the-sc
 
 ## Routing Configuration Options
 
+!!! note "Labels"
+    
+    - Labels are case insensitive.
+    - The complete list of labels can be found [the reference page](../reference/dynamic-configuration/rancher.md)
+
 ### General
 
 Traefik creates, for each rancher service, a corresponding [service](../routing/services/index.md) and [router](../routing/routers/index.md).