fixes

Author: lindseymoore

source/monitoring.txt

@@ -7,7 +7,7 @@ Monitor Your Application
 .. toctree::
    :caption: Monitoring categories
 
-   Custer Monitoring </monitoring/cluster-monitoring>
+   Cluster Monitoring </monitoring/cluster-monitoring>
 
 .. /monitoring/command-monitoring
 .. /monitoring/connection-monitoring

source/reference.txt

@@ -13,4 +13,4 @@ API Documentation
    MongoDB\GridFS\Bucket </reference/class/MongoDBGridFSBucket>
    Result Classes </reference/result-classes>
    Functions </reference/functions>
-   Exception </reference/exception-classes>
+   Exception Classes </reference/exception-classes>