fix Key Mgmt paragraph spacing

Author: valentinewallace

docs/key_mgmt.md

@@ -5,8 +5,12 @@ title: Key Management
 Relevant reference: https://docs.rs/lightning/0.0.12/lightning/chain/keysinterface/struct.KeysManager.html
 
 LDK Private Key Information is primarily provided through the `chain::keysinterface::KeysInterface` trait. It includes a few basic methods to get public and private key information, as well as a method to get an instance of a second trait which provides per-channel information - `chain::keysinterface::ChannelKeys`. While a custom `KeysInterface` implementation allows simple flexibility to control derivation of private keys, `ChannelKeys` focuses on signing lightning transactions and is primarily useful if you want to store private key material on a separate device which enforces lightning protocol details.
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 A simple implementation of `KeysInterface` is provided in the form of `chain::keysinterface::KeysManager`, see its documentation for more details on its key derivation. It uses `chain::keysinterface::InMemoryChannelKeys` for channel signing, which is likely an appropriate signer for custom `KeysInterface` implementations as well.
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 A `KeysManager` can be constructed simply with only a 32-byte seed and some integers which ensure uniqueness across restarts (defined as `starting_time_secs` and `starting_time_nanos`).
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 ```rust
 let mut random_32_bytes = [0; 32];
 // Fill in random_32_bytes with secure random data, or, on restart, reload the seed from disk.