Update docs/src/custom-transactions/transaction-builders.md

Co-authored-by: MujkicA <32431923+MujkicA@users.noreply.github.com>

docs/src/custom-transactions/transaction-builders.md

@@ -66,7 +66,7 @@ We need to do one more thing before we stop thinking about transaction inputs. E
 {{#include ../../../examples/cookbook/src/lib.rs:custom_tx_adjust}}
 ```
 
-> **Note** It is recommended to add signers before adjusting for fee as the estimation will include the witnesses fee.
+> **Note** It is recommended to add signers before calling `adjust_for_fee()` as the estimation will include the size of the witnesses.
 
 We can also define transaction policies. For example, we can limit the gas price by doing the following: