docs: fix incorrect example for WebviewBuilder::from_config

[egegungordu]

The example for WebviewBuilder::from_config was using the wrong function. This PR updates it to show the proper way to create a webview from a config.

[github-actions]

Package Changes Through 9b1e00e

There are 8 changes which include tauri-cli with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with minor, tauri with minor, @tauri-apps/api with minor, @tauri-apps/cli with minor, tauri-bundler with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.2.0	2.3.0
tauri-utils	2.1.1	2.2.0
tauri-bundler	2.2.3	2.2.4
tauri-runtime	2.3.0	2.4.0
tauri-runtime-wry	2.3.0	2.4.0
tauri-codegen	2.0.4	2.0.5
tauri-macros	2.0.4	2.0.5
tauri-plugin	2.0.4	2.0.5
tauri-build	2.0.5	2.0.6
tauri	2.2.5	2.3.0
@tauri-apps/cli	2.2.7	2.3.0
tauri-cli	2.2.7	2.3.0

Add another change file through the GitHub UI by following this link.

---

Read about change files or the docs at github.com/jbolda/covector