Bug#37651856: Crash after secondary is off. [MYSQL change]

Post-push fix: -Werror,-Wdocumentation error:
parameter 'THD' not found in the function declaration.

Change-Id: I72565eb3b10bee0c8d760637ed683ffd58366a38

Author: Tor Didriksen

sql/handler.h

@@ -2121,7 +2121,7 @@ typedef bool (*get_table_statistics_t)(
 
 /**
   Retrieve column_statistics from SE.
-  @param THD                      Current THD
+  @param thd                      Current THD
   @param db_name                  Name of schema
   @param table_name               Name of table
   @param column_name              Name of column