Documentation updates

Updates to the documentation for this release.

• New documentation for the new Alert Management UI has been added. You can also find new documentation for the JSON templates. For more information, see the Configuring alerts section of the Configuring guide.
• New documentation for the auditing features has been added. For more information, see the Configuring auditing section of the Configuring guide.
• The documentation for logstash has been updated. For more information, see Installing logstash in the Loading and streaming data section.
• New documentation has been added for the new Insight Packs. For more information, see Configuring Insight Packs in the Configuring guide.
• A new reference section has been added to the documentation. You can find all the relevant reference information and an API guide here. For more information, see the Reference section.