* Update release number to 123.
Github Issues:
* Add missing aspect mask descriptions to elink:VkImageAspectFlagBits
(public pull request 1029).
* Modify validity generator script to not check validity of ignored values
in same-parent valid usage statements (public pull request 1030).
* Make slink:VkDescriptorUpdateTemplateCreateInfo::pname:descriptorSetLayout
`noautovalidity` in `vk.xml` (public pull request 1031).
* Fix footnote markup in the <<vkGetDeviceProcAddr behavior>> table
(public pull request 1034).
Internal Issues:
* Require that <<interfaces-builtin-variables-sgs, code:SubgroupSize>> be
a power of two (internal issue 1499).
* Clarify that shaderFloat64 and shaderInt64 enable all storage classes,
while shaderFloat16, shaderInt8, and shaderInt16 only enable
non-interface storage classes. in the <<features-shaderFloat64>>,
<<features-shaderInt64>>, and <<features-shaderInt16>> descriptions and
for slink:VkPhysicalDeviceShaderFloat16Int8FeaturesKHR (internal issue
1582).
* Fix broken asciidoctor conditional logic in the
<<spirvenv-module-validation, Validation Rules within a Module>>
section, and add style guide language to help avoid this problem in the
future (internal issue 1808).
* Modify VUID assignment script to use the first API include in a block as
part of the VUID name rather than the last one, so the VUID is based on
the promoted API name (internal issue 1809).
* Cleanup string descriptions to consistently refer to "`null-terminated
UTF-8`" strings (internal issue 1813).
* Clarify the purpose of the
slink:VkPhysicalDeviceLimits::ptext:maxDescriptorSet* limits (internal
merge request 3357).
* Fix the slink:VkPhysicalDeviceRayTracingPropertiesNV limits for
pname:maxGeometryCount, pname:maxInstanceCount, and
pname:maxTriangleCount in the <<limits-required, Required Limits>>
section (internal issue 3372).
* Update SPIR-V image op sign-matching rules in the
<<spirvenv-module-validation, Validation Rules within a Module>>
section, the <<formats-numericformat>> table, and the
<<interfaces-resources-descset, Descriptor Set Interface>> section
(internal spirv/SPIR-V issue 332).
New Extensions
* `<<VK_KHR_shader_subgroup_extended_types>>`
* `<<VK_GOOGLE_user_type>>`
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