DOCSP-8513 Remove master terminology (#515)

Author: ianf-mongodb

source/troubleshooting/connection-errors.txt

@@ -247,8 +247,8 @@ current IP address, and appends these addresses with
    :atlas:`Configure Whitelist Entries </security-whitelist/>` in the
    |service| documentation.
 
-Not Master or Secondary is Not Writable
----------------------------------------
+Not Primary or Secondary is Not Writable
+----------------------------------------
 
 This error message indicates that you have connected to one of the
 secondary members of a replica set without providing the correct