vault: Point users of 'Check Aliases.base', etc to the latest docs

Author: claremacrae

resources/sample_vaults/Tasks-Demo/How To/Find properties not read by Obsidian 1.9.x/README.md

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+# Find properties not read by Obsidian 1.9.x
+
+## Update for Obsidian 1.9.x
+
+Obsidian 1.9.3 and above now provide a mechanism to update your vaults automatically.
+
+For background and how to use it, see: [Missing tags, aliases and cssclasses in some Obsidian 1.9.x versions](https://publish.obsidian.md/tasks/Support+and+Help/Missing+tags%2C+aliases+and+cssclasses+in+some+Obsidian+1.9.x+versions).