Block entries (@if, @defer, @for,@let, @switch) were falling back to the generic
DocsReference template, causing the description to appear twice - once in
the header section and once in the main content area.
This commit adds a dedicated rendering path for block entries:
- Creates BlockEntryRenderable type and associated transforms
- Adds BlockReference template that uses RawHtml directly
- Modifies HeaderApi to accept hideDescription prop
- Updates processing and rendering pipelines to handle blocks
The fix ensures block documentation displays only one description section
while preserving the existing behavior for all other API entry types.
Update adev/shared-docs/pipeline/api-gen/rendering/transforms/block-transforms.mts
Co-authored-by: Matthieu Riegler <kyro38@gmail.com>
