Add cURL examples for Cloud Databases

author: diane fleming
in 1st line, say full name of product: Rackspace Cloud Load Balancers
in Use the API section, improve intro sentence: Some of the basic operations you can perform with this API are described below.
standardize capitalization: list, node, cloud server, load balancer, all lower-case unless starting a sentence
correct formatting of heading Cache content for performance: remove stray ~
under Set limits, add Rate interval
in section Select the servers you want as nodes, add link to Quickstart for Cloud Servers
in section Select the servers you want as nodes, add link to Quickstart for Cloud Servers
in all Quickstarts, standardize sentince introducing the Use the API section
in Orchestration Quickstart, minor style changes to improve clarity
in Quickstart for Cloud DNS, clarify text for Modify zone
in Quickstart for Cloud DNS & its 9 samples: change all domain.com to example.com. domain.com is a real site; example.com is reserved for examples like this. we cannot use domain.com in Rackspace doc
in Quickstart for Cloud Databases: revise intro paragraph to improve clarity
improve definition of instance to remove redundant optimized-for-optimal
in Quickstart for Cloud Databases: improve text for clarity, mostly by standardizing capitalization and hyphenation; add note warning that making changes as root can be dangerous. Mike Asthalther's detailed comments are in https://jira.rax.io/browse/DEVDOC-97
in Quickstart for Cloud Queues: revise intro text to emphasize 2 patterns, producer-consumer & publisher-subscriber
in Quickstart for Cloud Queues: revise intro to each operation for consistent for, so each starts with To...; details on this & the previous commit are in https://jira.rax.io/browse/DEVDOC-91 from Catherine Richardson, Information Developer working with Cloud Queues
in Queues, improve formatting of bulleted list in intro; in Block storage, revise intro to emphasize 2 choices, standard & SSD
in Quickstart for Cloud Block Storage: revise intro to Delete Volume for consistent form; details on this & the previous commit are in https://jira.rax.io/browse/DEVDOC-98 from Catherine Richardson, Information Developer for Cloud Block Storage
in Quickstart for Cloud Files: revise intro