chore: update documentation URLs to use workspace setting

Replace all docs.rs documentation URLs with documentation.workspace = true
to inherit from the workspace's docs.pezkuwichain.io URL.

bizinikiwi/pezframe/examples/single-block-migrations/Cargo.toml

@@ -8,7 +8,7 @@ homepage.workspace = true
 repository.workspace = true
 description = "FRAME example pezpallet demonstrating best-practices for writing storage migrations."
 publish = false
-documentation = "https://docs.rs/pezpallet-example-single-block-migrations"
+documentation.workspace = true
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]