Removes misleading aliases and useless gas payers args

packages/docs/pages/users/fees.mdx

@@ -12,19 +12,17 @@ Fees are **always** paid from the balance of an **implicit** address. When expli
 Note the use  of the placeholder `keysha` for the key parameter. This is a completely configurable parameter, and should just refer to the alias of the key signing the transaction (that has a positive nam balance).
 </Callout>
 
-Let's suppose to have two accounts in our wallet, `accountant` controlling the `my-new-acc` implicit address and `keysha` controlling the `keysha-acc` implicit address.
-
 This means that in the transaction 
 ```shell copy
 namada client transfer \
-  --source my-new-acc \
+  --source accountant \
   --target validator-1 \
   --token NAM \
   --amount 10 \
   --signing-keys keysha
 ```
 
-the account `accountant` should pay the fees since it's the source of the transaction but given that the user provided the `--signing-keys` argument, the associated key `keysha` will be required to pay the fee from the balance of its implicit `keysha-acc` address. This means that even though the address `my-new-acc` may have a positive NAM balance, `keysha` will need to have the associated NAM in order to pay the transaction fee.
+the account `accountant` should pay the fees since it's the source of the transaction but given that the user provided the `--signing-keys` argument, the associated key `keysha` will be required to pay the fee from the balance of its implicit address. This means that even though the account `accountant` may have a positive NAM balance, `keysha` will need to have the associated NAM in order to pay the transaction fee.
 
 An identical result can be achieved with `--gas-payer keysha`. The two args `--signing-keys` and `--gas-payer` can also be used in conjuction: this is useful when we want to manually specify the signer of the transaction (if, for example, the client cannot infer the source by itself) but, at the same time, pay fees with a separate account that is not involved in the transaction.
 
@@ -45,12 +43,11 @@ For example, the following command will simulate a transfer transaction, and ret
 
 ```shell copy
 namadac transfer \
-  --source my-new-acc \
+  --source accountant \
   --target validator-1 \
   --token NAM \
   --amount 10 \
   --signing-keys keysha \
-  --gas-payer accountant \
   --dry-run-wrapper
 ```
 
@@ -65,25 +62,23 @@ Hence, when making the transfer, we could specify the `gas-limit` as follows:
 
 ```shell copy
 namadac transfer \
-  --source my-new-acc \
+  --source accountant \
   --target validator-1 \
   --token NAM \
   --amount 10 \
   --signing-keys keysha \
-  --gas-payer accountant \
   --gas-limit 150000
 ```
 
 If for some reason, we wanted to pay a higher gas fee, we could also specify that as follows:
 
 ```shell copy
 namadac transfer \
-  --source my-new-acc \
+  --source accountant \
   --target validator-1 \
   --token NAM \
   --amount 10 \
   --signing-keys keysha \
-  --gas-payer accountant \
   --gas-limit 150000 \
   --gas-price 0.01
 ```