chore(docs): fix example rpcclient.NewHTTPClient returning variables (#…

…2352)

In the [how to connect a Go app to
Gno.land](https://docs.gno.land/how-to-guides/connect-from-go) tutorial
I got an error when I tried to run this line:

```go
rpc := rpcclient.NewHTTPClient("<gno_chain_endpoint>")
```

It seems that NewHTTPClient returns 2 values
```go
func NewHTTPClient(rpcURL string) (*RPCClient, error);
``` 
and in the example we assign only one variable.

I updated the examples with:
```go
rpc, err := rpcclient.NewHTTPClient("<gno.land_remote_endpoint>")
if err != nil {
    panic(err)
}
```

There is also a step where `crypto.AddressFromBech32` is used but I
didn't found when the `crypto` was imported so I also added it in the
doc:

```go
import (
    ...
    crypto "github.com/gnolang/gno/tm2/pkg/crypto"
)
```

---------

Co-authored-by: Morgan <[email protected]>

docs/how-to-guides/connecting-from-go.md

@@ -109,7 +109,10 @@ A few things to note:
 You can initialize the RPC Client used to connect to the Gno.land network with
 the following line:
 ```go
-rpc := rpcclient.NewHTTPClient("<gno_chain_endpoint>")
+rpc, err := rpcclient.NewHTTPClient("<gno.land_remote_endpoint>")
+if err != nil {
+    panic(err)
+}
 ```
 
 A list of Gno.land network endpoints & chain IDs can be found in the [Gno RPC 
@@ -139,7 +142,10 @@ func main() {
 	}
 
 	// Initialize the RPC client
-	rpc := rpcclient.NewHTTPClient("<gno.land_remote_endpoint>")
+	rpc, err := rpcclient.NewHTTPClient("<gno.land_remote_endpoint>")
+	if err != nil {
+		panic(err)
+	}
 
 	// Initialize the gnoclient
 	client := gnoclient.Client{
@@ -158,6 +164,13 @@ To send transactions to the chain, we need to know the account number (ID) and
 sequence (nonce). We can get this information by querying the chain with the
 `QueryAccount` function:
 
+```go
+import (
+    ...
+    "github.com/gnolang/gno/tm2/pkg/crypto"
+)
+```
+
 ```go
 // Convert Gno address string to `crypto.Address`
 addr, err := crypto.AddressFromBech32("g1jg8mtutu9khhfwc4nxmuhcpftf0pajdhfvsqf5") // your Gno address