update ref of blob custom media type (#5247)

Author: estepona

content/rest/reference/git.md

@@ -20,7 +20,7 @@ The Git Database API gives you access to read and write raw Git objects to your
 ## Blobs
 
 A Git blob (binary large object) is the object type used to store the contents of each file in a repository. The file's SHA-1 hash is computed and stored in the blob object. These endpoints allow you to read and write [blob objects](https://git-scm.com/book/en/v1/Git-Internals-Git-Objects)
-to your Git database on {% data variables.product.product_name %}. Blobs leverage [these custom media types](#custom-media-types). You can read more about the use of media types in the API [here](/rest/overview/media-types).
+to your Git database on {% data variables.product.product_name %}. Blobs leverage [these custom media types](#custom-media-types-for-blobs). You can read more about the use of media types in the API [here](/rest/overview/media-types).
 
 ### Custom media types for blobs