small fixes to dotnet docs (#8468)

Author: 0xFirekeeper

apps/portal/src/app/dotnet/contracts/read/page.mdx

@@ -12,15 +12,15 @@ Use `ThirdwebContract.Read` to fetch data from a smart contract without making a
 ## Usage
 
 ```csharp
-var result = await contract.Read<T>(contract, "methodName", parameters);
+// Static
+var result = await ThirdwebContract.Read<T>(contract, "methodName", parameters);
+
+// Extension
+var result = await contract.Read<T>("methodName", parameters);
 ```
 
 <Details summary="Parameters">
 
-### contract (required)
-
-An instance of `ThirdwebContract`. Represents the smart contract you want to interact with.
-
 ### methodName (required)
 
 The name of the contract method you wish to call. Must be a `string`.

apps/portal/src/app/dotnet/contracts/write/page.mdx

@@ -12,7 +12,11 @@ The `ThirdwebContract.Write` method allows you to execute transactions that alte
 ## Usage
 
 ```csharp
-var transactionReceipt = await contract.Write(wallet, contract, "methodName", weiValue, parameters);
+// Static
+var receipt = await ThirdwebContract.Write(wallet, contract, "transfer", weiValue, toAddress, amount);
+
+// Extension
+var transactionReceipt = await contract.Write(wallet, "methodName", weiValue, parameters);
 ```
 
 <Details summary="Parameters">
@@ -21,10 +25,6 @@ var transactionReceipt = await contract.Write(wallet, contract, "methodName", we
 
 An instance of `IThirdwebWallet`. This represents the signer of the transaction, which can be any type of wallet provider.
 
-### contract (required)
-
-An instance of `ThirdwebContract`. Represents the smart contract you wish to interact with.
-
 ### methodName (required)
 
 The name of the smart contract method you intend to call. Must be a `string`.
@@ -57,9 +57,6 @@ string contractAddress = "0x..."; // Your contract address
 var client = ThirdwebClient.Create(secretKey: "yourSecretKey");
 var contract = await ThirdwebContract.Create(client, contractAddress, chainId);
 
-// The wallet that signs and sends the transaction
-var wallet = await PrivateKeyWallet.Create(client, "yourPrivateKeyHex");
-
 // Assuming transfer takes an address and an amount as parameters
 string toAddress = "0x...";
 BigInteger amount = new BigInteger(1000); // The amount to transfer
@@ -68,7 +65,7 @@ BigInteger amount = new BigInteger(1000); // The amount to transfer
 BigInteger weiValue = BigInteger.Zero;
 
 // Executing the transfer
-var receipt = await contract.Write(wallet, contract, "transfer", weiValue, toAddress, amount);
+var receipt = await contract.Write(wallet, "transfer", weiValue, toAddress, amount);
 Console.WriteLine($"Transaction receipt: {receipt}");
 ```
 

apps/portal/src/app/dotnet/transactions/prepare/page.mdx

@@ -23,13 +23,22 @@ Looking for the contract APIs themselves? Check out the [Contracts guides](/dotn
 ## Usage
 
 ```csharp
-ThirdwebTransaction transaction = await contract.Prepare(
+// Static
+ThirdwebTransaction transaction = await ThirdwebContract.Prepare(
     wallet,
     contract,
     "methodName",
     weiValue,
     parameters
 );
+
+// Extension
+ThirdwebTransaction transaction = await contract.Prepare(
+    wallet,
+    "methodName",
+    weiValue,
+    parameters
+);
 ```
 
 Once prepared, you can tweak or send the transaction: