Improve Client CLI help readability (#2073)

Currently the CLI `-h/--help` commad output is almost unreadable as (for
some commands) it:
- doesn't provide a short brief of what the command does.
- doesn't separate the options description in smaller paragraphs.
- doesn't use a smart wrap strategy for lines longer than the number of
columns in the terminal.

Follow some pics taken with a 100 cols wide term

## Short help (./node -h)

### Before


![20231028-174531-grim](https://github.com/paritytech/polkadot-sdk/assets/8143589/11b62c3c-dcd5-43f4-ac58-f1b299e3f4b9)

### After


![20231028-175041-grim](https://github.com/paritytech/polkadot-sdk/assets/8143589/dc08f6fd-b287-40fb-8b33-71a185922104)


## Long help (./node --help)

### Before


![20231028-175257-grim](https://github.com/paritytech/polkadot-sdk/assets/8143589/9ebdc0ae-54ee-4760-b873-a7e813523cb6)

### After


![20231028-175155-grim](https://github.com/paritytech/polkadot-sdk/assets/8143589/69cbe5cb-eb2f-46a5-8ebf-76c0cf8c4bad)

---------

Co-authored-by: command-bot <>

substrate/client/cli/src/params/offchain_worker_params.rs

@@ -32,8 +32,7 @@ use crate::{error, OffchainWorkerEnabled};
 /// Offchain worker related parameters.
 #[derive(Debug, Clone, Args)]
 pub struct OffchainWorkerParams {
-	/// Should execute offchain workers on every block.
-	/// By default it's only enabled for nodes that are authoring new blocks.
+	/// Execute offchain workers on every block.
 	#[arg(
 		long = "offchain-worker",
 		value_name = "ENABLED",
@@ -43,8 +42,9 @@ pub struct OffchainWorkerParams {
 	)]
 	pub enabled: OffchainWorkerEnabled,
 
-	/// Enable Offchain Indexing API, which allows block import to write to Offchain DB.
-	/// Enables a runtime to write directly to a offchain workers DB during block import.
+	/// Enable offchain indexing API.
+	///
+	/// Allows the runtime to write directly to offchain workers DB during block import.
 	#[arg(long = "enable-offchain-indexing", value_name = "ENABLE_OFFCHAIN_INDEXING", default_value_t = false, action = ArgAction::Set)]
 	pub indexing_enabled: bool,
 }