DOCSP-38431: Typo fix (#7388) (#7390)

Author: sarah-olson-mongodb

source/reference/parameters.txt

@@ -1746,7 +1746,7 @@ General Parameters
 
    Default: 0
 
-   If you enable ``tmallocAggressiveMemoryDecommit``, MongoDB:
+   If you enable ``tcmallocAggressiveMemoryDecommit``, MongoDB:
 
    - releases a :term:`chunk <chunk>` of memory to system, and