use undescore in zip file names

Author: Helene

IMPORTING_EXAMPLE_DASHBOARDS.md

@@ -1,13 +1,13 @@
 ### Importing dashboards from Example Dashboards bundle
 
-With the bridge version 4, the new collection of example dashboards (["Example Dashboards bundle"](example_dashboards_bundle.zip)) has been added to the available for free download resources. These new dashboards could be used for managing a multi-cluster environment. Also the ["default dashboards set"](default dashboards set.zip) and  ["Advanced Dashboards set"](Advanced dashboard set.zip)  have been merged into this download package.
+With the bridge version 4, the new collection of example dashboards (["Example Dashboards bundle"](example_dashboards_bundle.zip)) has been added to the available for free download resources. These new dashboards could be used for managing a multi-cluster environment. Also the ["default dashboards set"](default_dashboards_set.zip) and  ["Advanced Dashboards set"](Advanced_dashboard_set.zip)  have been merged into this download package.
 
 
 
 The package content consists of several folders:
 
-- Predefined Basic Dashboards - including all dashboard examples from ["default dashboards set"](default dashboards set.zip) package
-- Advanced Dashboards -  including all dashboard examples from ["Advanced Dashboards set"](Advanced dashboard set.zip) package
+- Predefined Basic Dashboards - including all dashboard examples from ["default dashboards set"](default_dashboards_set.zip) package
+- Advanced Dashboards -  including all dashboard examples from ["Advanced Dashboards set"](Advanced_dashboard_set.zip) package
 - HOWTO - including dashboard examples with learning effect, f.e. Grafana's helpful features
 - NamedQueries - including dashboard examples for monitoring Linux(Network) metrics
 - Protocols - including dashboard examples for monitoring SMB and NFS metrics