doc: update decision

see #1291

doc/decisions/global_validation.md

@@ -1,33 +1,36 @@
-# Global Validation
+# Global Validation #
 
-## Issue
+## Issue ##
 
 Links and validation constraints might point to keys not loaded
 with the respective `kdbGet`.
 
-## Constraints
+## Constraints ##
 
 - no workaround such as `kdb get -a`
 
-## Assumptions
+## Assumptions ##
 
-## Considered Alternatives
+## Considered Alternatives ##
 
 - global plugin can register additional backends to load
 - split `kdbGet` into multiple steps:
+  0. do `kdbGet` on `system/elektra` to update mountpoints
   1. first do `kdbGet` on the `spec/`-namespace
   2. then calculate which backends are needed
   3. then fetch all backends as needed
 - split loops in `kdbGet` not only according placements
   but also according namespace (get spec first)
 
 
-## Decision
+## Decision ##
 
-## Argument
+## Argument ##
 
-## Implications
+## Implications ##
 
-## Related decisions
+## Related decisions ##
 
-## Notes
+## Notes ##
+
+see #1291