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/staking-async/runtimes/preset-store/Cargo.toml

@@ -8,7 +8,7 @@ description = "Simple pezpallet to store the preset used to generate a runtime's
 license.workspace = true
 homepage.workspace = true
 repository.workspace = true
-documentation = "https://docs.rs/pezpallet-staking-async-preset-store"
+documentation.workspace = true
 
 
 [dependencies]