Fix MONGOID-5139 mongoid.yml template socket timeout default is incorrect (#5296)

Co-authored-by: Oleg Pudeyev <[email protected]>

Author: p-mongo

source/reference/configuration.txt

@@ -220,8 +220,13 @@ for details on driver options.
           # (default: 10)
           connect_timeout: 10
 
-          # The timeout to wait to execute operations on a socket before raising an error.
-          # (default: nil)
+          # How long to wait for a response for each operation sent to the
+          # server. This timeout should be set to a value larger than the
+          # processing time for the longest operation that will be executed
+          # by the application. Note that this is a client-side timeout;
+          # the server may continue executing an operation after the client
+          # aborts it with the SocketTimeout exception.
+          # (default: nil, meaning no timeout)
           socket_timeout: 5
 
           # The name of the replica set to connect to. Servers provided as seeds that do