Update Go item creation in documentation to use URL field type for website

[libutcher]

Current Behavior

In the Go example file, the example for creating a new item includes a web address saved in a text field type.

Here's the relevant bit of code:

{
				ID:        "uniqueId",
				Title:     "Web address",
				Value:     "1password.com",
				FieldType: onepassword.ItemFieldTypeText,
				SectionID: &sectionID,
			},

Desired Behavior

We should update the item creation example to instead save the web address in a URL field type.

Benefits & Value

If the web address is added in a URL field type, it will display correctly in the 1Password app.

Additional information

No response

[sdahlbac]

Does good first issue label make sense given #164 ?

[libutcher]

This is no longer an issue with the recent change to how autofill websites are added, closing!