Rename message to markwdown on the webex notifier

Signed-off-by: gotjosh <josue.abreu@gmail.com>

notify/webex/webex.go

@@ -70,7 +70,7 @@ func New(c *config.WebexConfig, t *template.Template, l log.Logger, httpOpts ...
 }
 
 type webhook struct {
-	Message string `json:"markdown"`
+	Markdown string `json:"markdown"`
 	RoomID   string `json:"roomId,omitempty"`
 }
 
@@ -100,7 +100,7 @@ func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error)
 	}
 
 	w := webhook{
-		Message: message,
+		Markdown: message,
 		RoomID:   n.conf.RoomID,
 	}