added note about index_count column to the README.md

Author: Hannah Vernon

sp_IndexCleanup/README.md

@@ -84,6 +84,7 @@ EXECUTE dbo.sp_IndexCleanup
 - The multi-database processing feature (@get_all_databases) analyzes each database sequentially for better performance and resource management
 - System databases (master, model, msdb, tempdb, rdsadmin) are always excluded from processing
 - When using @get_all_databases, results for all databases are combined in a single result set
+- The index_count column for the SUMMARY row in the output table will likely indicate a lower number than is shown at the DATABASE level.  The SUMMARY level only includes indexes that have been analyzed; excluding things like clustered indexes, heaps, xml indexes, etc.  The DATABASE level index_count value is the total number of indexes in the database.
 
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 Released under MIT license