Unhardcode parameters for rocky and queens

timeout_nbd and heal_instance_info_cache_interval were available
for configuration in pike so should be available and in later
releases.

Change-Id: I3bf9bcde5f60761826926d5a6e00893980925681
Related-Prod: https://mirantis.jira.com/browse/PROD-27288
diff --git a/README.rst b/README.rst
index 51ed2d1..a290d34 100644
--- a/README.rst
+++ b/README.rst
@@ -274,6 +274,8 @@
       compute:
         version: juno
         enabled: true
+        timeout_nbd: 10
+        heal_instance_info_cache_interval: 60
         cross_az_attach: false
         disk_cachemodes: network=writeback,block=none
         availability_zone: availability_zone_01