Shared: Add missing QLDoc and change note

Author: jketema

shared/concepts/change-notes/20225-07-16-initial-shared-concepts.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* Initial release. Moves the shared concepts library into its own qlpack.

shared/concepts/codeql/concepts/ConceptsShared.qll

@@ -16,6 +16,9 @@ private import CryptoAlgorithms as CA
 private import codeql.dataflow.DataFlow as DF
 private import codeql.util.Location
 
+/**
+ * Construct the shared concepts modules.
+ */
 module ConceptsMake<LocationSig Location, DF::InputSig<Location> DataFlowLang> {
   final private class DataFlowNode = DataFlowLang::Node;