Merge pull request github#6322 from shati-patel/shati-patel/docs-multi-dbs-vscode

Docs: Running query on multiple DBs in CodeQL for VS Code

Author: shati-patel

docs/codeql/codeql-for-visual-studio-code/analyzing-your-projects.rst

@@ -97,6 +97,15 @@ For example, in the following snippet, you could select the predicate name ``foo
 
    predicate foo(string s) { s = "bar" }
 
+Running a query on multiple databases
+--------------------------------------
+
+This is helpful if you want to test your query on multiple codebases, or find a vulnerability in multiple projects.
+
+#. Open a query (``.ql``) file.
+#. Right-click and select **CodeQL: Run Query on Multiple Databases**.
+#. From the dropdown menu, select the databases that you want to run the query on.
+
 Viewing previous queries
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