chore: update documentation from cosmos-sdk/docs (#271)

* chore: Sync docs from cosmos-sdk/docs

* Delete docs/build/tooling/03-hubl.md

* Delete versioned_docs/version-0.52/build/tooling/03-hubl.md

---------

Co-authored-by: tac0turtle <[email protected]>
Co-authored-by: Julien Robert <[email protected]>

docs/build/migrations/02-upgrading.md

@@ -1236,8 +1236,6 @@ For example, assuming you put all your proto files in subfolders inside your roo
 
 If you are using a custom folder structure for your proto files, please reorganize them so that their OS path matches their proto package name.
 
-This is to allow the proto FileDescriptSets to be correctly registered, and this standardized OS import paths allows [Hubl](https://github.com/cosmos/cosmos-sdk/tree/main/tools/hubl) to reflectively talk to any chain.
-
 #### `{accepts,implements}_interface` proto annotations
 
 The SDK is normalizing the strings inside the Protobuf `accepts_interface` and `implements_interface` annotations. We require them to be fully-scoped names. They will soon be used by code generators like Pulsar and Telescope to match which messages can or cannot be packed inside `Any`s.

docs/build/tooling/README.md

@@ -11,7 +11,6 @@ This includes tools for development, operating a node, and ease of use of a Cosm
 
 * [Cosmovisor](./01-cosmovisor.md)
 * [Confix](./02-confix.md)
-* [Hubl](./03-hubl.md)
 * [Rosetta](https://docs.cosmos.network/main/run-node/rosetta)
 
 ## Other Tools

docs/learn/advanced/17-autocli.md

@@ -94,7 +94,7 @@ The keyring is then converted to the `client/v2/autocli/keyring` interface.
 If no keyring is provided, the `autocli` generated command will not be able to sign transactions, but will still be able to query the chain.
 
 :::tip
-The Cosmos SDK keyring and Hubl keyring both implement the `client/v2/autocli/keyring` interface, thanks to the following wrapper:
+The Cosmos SDK keyring implements the `client/v2/autocli/keyring` interface, thanks to the following wrapper:
 
 ```go
 keyring.NewAutoCLIKeyring(kb)
@@ -283,10 +283,6 @@ According to the [Cobra documentation](https://pkg.go.dev/github.com/spf13/cobra
 
 `autocli` lets you generate CLI to your Cosmos SDK-based applications without any cobra boilerplate. It allows you to easily generate CLI commands and flags from your protobuf messages, and provides many options for customising the behavior of your CLI application.
 
-To further enhance your CLI experience with Cosmos SDK-based blockchains, you can use `hubl`. `hubl` is a tool that allows you to query any Cosmos SDK-based blockchain using the new AutoCLI feature of the Cosmos SDK. With `hubl`, you can easily configure a new chain and query modules with just a few simple commands.
-
-For more information on `hubl`, including how to configure a new chain and query a module, see the [Hubl documentation](https://docs.cosmos.network/main/build/tooling/hubl).
-
 # Off-Chain
 
 Off-chain is a `client/v2` package providing functionalities for allowing to sign and verify files with two commands:

docs/user/run-node/00-keyring.md

@@ -29,12 +29,14 @@ is a list of the most popular operating systems and their respective passwords m
 * GNU/Linux:
     * [libsecret](https://gitlab.gnome.org/GNOME/libsecret)
     * [kwallet](https://api.kde.org/frameworks/kwallet/html/index.html)
+    * [keyctl](https://www.kernel.org/doc/html/latest/security/keys/core.html)
 
 GNU/Linux distributions that use GNOME as default desktop environment typically come with
 [Seahorse](https://wiki.gnome.org/Apps/Seahorse). Users of KDE based distributions are
 commonly provided with [KDE Wallet Manager](https://userbase.kde.org/KDE_Wallet_Manager).
 Whilst the former is in fact a `libsecret` convenient frontend, the latter is a `kwallet`
-client.
+client. `keyctl` is a secure backend leverages the Linux's kernel security key management system
+to store cryptographic keys securely in memory.
 
 `os` is the default option since operating system's default credentials managers are
 designed to meet users' most common needs and provide them with a comfortable
@@ -93,6 +95,15 @@ GNU/Linux distributions that ships KDE as default desktop environment. Please re
 [KWallet Handbook](https://docs.kde.org/stable5/en/kwalletmanager/kwallet5/index.html) for more
 information.
 
+### The `keyctl` backend
+
+The *Kernel Key Retention Service*  is a security facility that
+has been added to the Linux kernel relatively recently. It allows sensitive
+cryptographic data such as passwords, private key, authentication tokens, etc
+to be stored securely in memory.
+
+The `keyctl` backend is available on Linux platforms only.
+
 ### The `test` backend
 
 The `test` backend is a password-less variation of the `file` backend. Keys are stored