Update fee grant guide (#491)

* Update the constatinde donom in the create allowance command and remove the unsupported block return type block

* Update the javascript code to get the offline signer andincrease the fee miltiplier

content/2.developers/3.guides/5.fee-grant/2.grant-allowance.md

@@ -35,7 +35,6 @@ archwayd tx feegrant grant "${granter_addr}" "${grantee_address}" \
     --gas auto \
     --gas-prices "$(archwayd q rewards estimate-fees 1 --node 'https://rpc.mainnet.archway.io:443' --output json | jq -r '.gas_unit_price | (.amount + .denom)')" \
     --gas-adjustment 1.3 \
-    --broadcast-mode block \
     --output json \
     --yes
 ```
@@ -52,13 +51,12 @@ testnet
 archwayd tx feegrant grant "${granter_addr}" "${grantee_address}" \
     --chain-id "constantine-3" \
     --node "https://rpc.constantine.archway.io:443" \
-    --spend-limit 500000000000000000aarch \
+    --spend-limit 500000000000000000aconst \
     --expiration 2025-12-31T23:00:00Z \
     --allowed-messages '/cosmwasm.wasm.v1.MsgExecuteContract' \
     --gas auto \
     --gas-prices $(archwayd q rewards estimate-fees 1 --node 'https://rpc.constantine.archway.io:443' --output json | jq -r '.gas_unit_price | (.amount + .denom)') \
     --gas-adjustment 1.3 \
-    --broadcast-mode block \
     --output json \
     --yes
 ```

content/2.developers/3.guides/5.fee-grant/3.utilize-grant.md

@@ -275,7 +275,7 @@ await window.keplr.enable(chainId);
 ::highlight-card
 
 ```javascript
-const offlineSigner = window.keplr.getOfflineSignerAuto(chainId);
+const offlineSigner = window.getOfflineSigner(chainId);
 const signingClient = await SigningArchwayClient.connectWithSigner(ChainInfo.rpc, offlineSigner);
 ```
 
@@ -336,7 +336,7 @@ const messages = [executeMsg];
 ::highlight-card
 
 ```javascript
-const fee = await signingClient.calculateFee(signerAddress, messages, '', 1.5, feeGranterAddress);
+const fee = await signingClient.calculateFee(signerAddress, messages, '', 1.7, feeGranterAddress);
 ```
 
 ::