adding release notes

Author: stevenwinship

doc/release-notes/11280-search-api-count-per-object.md

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+## Bug fix to Search API. Now includes all type totals (Dataverses, Dataset, and Files) regardless of the list of types requested
+
+None requested types were returned with total count set to 0.
+&type=dataverse&type=dataset would result in "Files" : 0 since type=file was not requested
+
+Now all counts show the correct totals.
+Note: This is only true for the first page requested. Subsequent pages could have 0 counts and should not be used. This is due to the need for speed. Getting the totals is an additional search call in the background.