[7.2] Transaction Troubleshooting Guide: Update as per Minimalism principles

As discussed during the Crowdsourced Minimalism session, dated 20th Sept 2018

Key recommendation from the session is to update the document title to 'Managing Transactions on JBoss EAP', which was decided upon via https://docs.google.com/spreadsheets/d/1bGSEwnqmM9UPIXE6h61NYt84iPdKtfRPfqnpFf1S2Gk/edit?ts=5babd76e#gid=0

Google Notes document
https://docs.google.com/document/d/1gE9LzMd-XpIg3WmwtOrLMHwy4YM0VtmfcJ56uN2x-qk/edit?usp=sharing

Google Source document
https://docs.google.com/document/d/1gqwYNSDtYJRIMOuVlii7tPexiDJvy5DHUG7x4x9Qrjk/edit?usp=sharing