chore: fix some comments (#724)

Signed-off-by: reallylowest <[email protected]>

Author: reallylowest

src/types/transaction.rs

@@ -87,7 +87,7 @@ pub struct Receipt {
     pub cumulative_gas_used: U256,
     /// Gas used by this transaction alone.
     ///
-    /// Gas used is `None` if the the client is running in light client mode.
+    /// Gas used is `None` if the client is running in light client mode.
     #[serde(rename = "gasUsed")]
     pub gas_used: Option<U256>,
     /// Contract address created, or `None` if not a deployment.