DOCSP-30560: Connection troubleshooting tech review (#55)

Author: norareidy

source/connection-troubleshooting.txt

@@ -78,7 +78,7 @@ verify the correct port is open in your firewall.
 Check the Number of Connections
 -------------------------------
 
-Each ``MongoClient`` instance supports a maximum number of concurrent open
+Each ``Client`` instance supports a maximum number of concurrent open
 connections in its connection pool. The configuration parameter ``maxPoolSize``
 defines this value and is set to ``100`` by default. If there are already a
 number of open connections equal to ``maxPoolSize``, the server waits until