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Description of problem:
Chapter 4.3.1
http://documentation-devel.engineering.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Getting_Started_Guide/sec-virtualized-hardware-devices.html#sec-virt-emulated-devices

Emulated sound devices
The following two emulated sound devices are also available, but are not recommended due to compatibility issues with certain guest operating systems:

Comments : Just one not two

Emulated storage drivers
Comments: Missing ahci interface

please add the missing interface

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

So this bug is about two problems:

 - "The following two emulated sound device is also available" (there's only one)
 - Missing documentation for AHCI, which is a storage device/driver

AHCI is tech-preview and should be used only with Q35 (ICH9). Q35 is also tech-preview and is a system component ("host northbridge", or simply "host PCI bridge", as used to document I440FX, which is the default).

So both AHCI and Q35 should be documented as tech-preview. The alternative is to not document them in the administration guides at all, which is also fine by me.