Docs: Hot Rod Transaction Support Feedback

https://access.qa.redhat.com/documentation/en-us/red_hat_data_grid/7.3/html-single/red_hat_data_grid_user_guide/index#hr_transactions

Feedback for on Hot Rod Transaction docs:

Server Guide

• 6.2.6 Transactions
  Remove: While it is possible to configure server caches to be transactional, none of the available protocols offer transaction capabilities.

User Guide

• 20.7.21.2.2 Transaction Modes
  "The transaction mode names are the same for server configuration and for client settings.
  To prevent from confusion it should be clarified here that this is the client setting
  and the server will not work correctly if the client use Tx but the server has no Tx setting.
  This should fail at runtime if the client request a Tx for a non-tx-cache (but I did not tested this yet)"

• 20.7.21
  "The introducing paragraph and the tip mention that the client side Tx is quasi optimistic.
  But there is no highlighted node that the consistence is possibly affected by that.
  There should be a warning and a link to the detailed description 20.7.21.4 to makes this as clear as possible."

Additionally:
"to make it simple for the user if you don't highlight to implement a custom TxManager, this is only needed to integrate other implementations.
If not needed, the GenericTxM is the best choice as it will use our TxM inside EAP or the RemoteTxM if there is nothing found.
So this will be 99% of the use cases (or more)"