chore: fix some minor issues in comments (#2693)

Signed-off-by: houpo-bob <houpocun@outlook.com>
Co-authored-by: Ryan Lee <ryan@parity.io>

Author: houpo-bob

packages/light-client-extension-helpers/src/tx-helper/polkadot-api/tx-helper/tx.ts

@@ -166,7 +166,7 @@ export const createTxEntry = <
                   block: atBlock,
                 })),
               )
-            : throwError(() => new Error(`Uknown block ${at}`)),
+            : throwError(() => new Error(`Unknown block ${at}`)),
         ),
       )
     }

packages/light-client-extension-helpers/src/tx-helper/polkadot-api/tx-helper/types.ts

@@ -271,7 +271,7 @@ export type InnerTransaction<
   /**
    * Estimate fees against the latest known `finalizedBlock`
    *
-   * @param from       Public key or address from the potencial sender.
+   * @param from       Public key or address from the potential sender.
    * @param txOptions  Optionally pass any number of txOptions.
    * @returns Fees in fundamental units.
    */
@@ -282,7 +282,7 @@ export type InnerTransaction<
   /**
    * Payment info against the latest known `finalizedBlock`
    *
-   * @param from       Public key or address from the potencial sender.
+   * @param from       Public key or address from the potential sender.
    * @param txOptions  Optionally pass any number of txOptions.
    * @returns PaymentInfo for the given transaction (weight, estimated fees
    *          and class).