Fix: Create metablock link in block attributes documentaion.

docs/reference-guides/block-api/block-attributes.md

@@ -357,7 +357,7 @@ Attribute available in the block:
 ### Meta source (deprecated)
 
 <div class="callout callout-alert">
-Although attributes may be obtained from a post's meta, meta attribute sources are considered deprecated; <a href="https://github.com/WordPress/gutenberg/blob/c367c4e2765f9e6b890d1565db770147efca5d66/packages/core-data/src/entity-provider.js">EntityProvider and related hook APIs</a> should be used instead, as shown in the <a href="/block-editor/how-to-guides/metabox/#step-2-add-meta-block">Create Meta Block how-to</a>.
+Although attributes may be obtained from a post's meta, meta attribute sources are considered deprecated; <a href="https://github.com/WordPress/gutenberg/blob/c367c4e2765f9e6b890d1565db770147efca5d66/packages/core-data/src/entity-provider.js">EntityProvider and related hook APIs</a> should be used instead, as shown in the <a href="/docs/how-to-guides/metabox.md#step-2-add-meta-block">Create Meta Block how-to</a>.
 </div>
 
 Attributes may be obtained from a post's meta rather than from the block's representation in saved post content. For this, an attribute is required to specify its corresponding meta key under the `meta` key.