devguides: fix typo

Author: plowsof

resources/developer-guides/wallet-rpc.md

@@ -3272,7 +3272,7 @@ Outputs:
 Example:
 
 ```
-$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"frozen","params":{"key_image":"d0071ab34ab7f567f9b54303ed684de6cd5ed969a6b6c4bf352d25242f0b3da9"}}' -H 'Contentt-Type: application/json'
+$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"frozen","params":{"key_image":"d0071ab34ab7f567f9b54303ed684de6cd5ed969a6b6c4bf352d25242f0b3da9"}}' -H 'Content-Type: application/json'
 {
   "id": "0",
   "jsonrpc": "2.0",
@@ -3300,7 +3300,7 @@ Outputs:
 Example:
 
 ```
-$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"thaw","params":{"key_image":"d0071ab34ab7f567f9b54303ed684de6cd5ed969a6b6c4bf352d25242f0b3da9"}}' -H 'Contentt-Type: application/json'
+$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"thaw","params":{"key_image":"d0071ab34ab7f567f9b54303ed684de6cd5ed969a6b6c4bf352d25242f0b3da9"}}' -H 'Content-Type: application/json'
 {
   "id": "0",
   "jsonrpc": "2.0",
@@ -3361,7 +3361,7 @@ Outputs:
 Example:
 
 ```
-$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"estimate_tx_size_and_weight","params":{"n_inputs":1,"n_outputs":2,"ring_size":16,"rct":true}}' -H 'Contentt-Type: application/json'
+$ curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"estimate_tx_size_and_weight","params":{"n_inputs":1,"n_outputs":2,"ring_size":16,"rct":true}}' -H 'Content-Type: application/json'
 {
   "id": "0",
   "jsonrpc": "2.0",