Fixed typo at line 39

On this code example for the documentation there was a typo on the README.md file at line 39. There was an `;` where there should not be one.

The code that had the typo:

```cs
var tb = new TextInputBuilder()
    .WithLabel("Labeled")
    .WithCustomId("text_input")
    .WithStyle(TextInputStyle.Paragraph)
    .WithMinLength(6); // This ";" does not belong here.
    .WithMaxLength(42)
    .WithRequired(true)
    .WithPlaceholder("Consider this place held.");
```

docs/guides/int_basics/message-components/text-input.md

@@ -35,11 +35,11 @@ and min/max length of the input:
 var tb = new TextInputBuilder()
     .WithLabel("Labeled")
     .WithCustomId("text_input")
-	.WithStyle(TextInputStyle.Paragraph)
-	.WithMinLength(6);
-	.WithMaxLength(42)
-	.WithRequired(true)
-	.WithPlaceholder("Consider this place held.");
+    .WithStyle(TextInputStyle.Paragraph)
+    .WithMinLength(6)
+    .WithMaxLength(42)
+    .WithRequired(true)
+    .WithPlaceholder("Consider this place held.");
 ```
 
 ![more advanced text input](images/image9.png)