fixes

Author: miiu96

docs/sdk-and-tools/rest-api/transactions.mdx

@@ -422,11 +422,11 @@ The cost is estimated successfully.
 
 :::tip
 - Use the returned `txGasUnits` value as the `gasLimit` in your actual transaction.
-- Make sure to provide the correct `nonce` of transaction
+- Make sure to provide the correct `nonce` of the transaction
 :::
 
 :::tip
-`Best practice:` when sending the transaction, add ~10% extra gas to the estimated value to avoid underestimation and failure due to insufficient gas.
+**Best practice:** when sending the transaction, add ~10% extra gas to the estimated value to avoid underestimation and failure due to insufficient gas.
 :::
 
 Here's an example of a request: