Update manifest.json (#2156)

This PR is part of an initiative to improve advertising the help resources for plugins in the Obsidian community. I won't be offended if you reject this, but please consider it to promote access to your excellent written documentation. 

https://forum.obsidian.md/t/links-to-help-and-manuals-for-plugins-and-themes/70733

Author: TfTHacker

manifest.json

@@ -6,5 +6,6 @@
   "description": "Complex data views for the data-obsessed.",
   "author": "Michael Brenan <blacksmithgu@gmail.com>",
   "authorUrl": "https://github.com/blacksmithgu",
+  "helpUrl": "https://blacksmithgu.github.io/obsidian-dataview/",
   "isDesktopOnly": false
 }