Update Developer_deployment.md

[nlharris]

• Added more details to Accounts table. Who needs to approve developer accounts? (Sometimes that can take a while. The new developer should be aware that a person needs to approve their account request, so it won't be approved instantly like the KBase user accounts.)
• Since there has been a lot of confusion about JIRA accounts, I thought it would be a good idea to mention here that you can't change your JIRA username or password in JIRA. (You already said "You should be able to access Jira using your KBase developer account username and password," but since people have tried to change their JIRA password from inside JIRA, it seems worth adding this extra information.)
• Added link to Git tutorials
• Fixed a few random typos and awkward wording
• Spelled out a few abbreviations and acronyms (or, in the case of Pull Request, added the abbreviation "PR").

[fperez]

Great, many thanks! Excellent changes.