Wiki documentation is outdated: `Plugin` is no longer an `spi` interface

[jpschorr]

partiql-lang-kotlin/docs/wiki/tutorials/Pluggable Functions Tutorial.md

Lines 56 to 77 in 920a76f

	## Step 3: Implement the Plugin Interface
	Next, you need to implement the `Plugin` interface in your code. This allows you to return a list of all the custom `PartiQLFunction` implementations you've created, using the `getFunctions()` method. This step is crucial as it allows the service loader to retrieve all your custom functions.
	Here's an example of a `Plugin` implementation:
	```Kotlin
	package org.partiql.plugins.mockdb
	import org.partiql.spi.Plugin
	import org.partiql.spi.connector.Connector
	import org.partiql.spi.function.PartiQLFunction
	public class LocalPlugin implements Plugin {
	override fun getConnectorFactories(): List<Connector.Factory> = listOf()
	@PartiQLFunctionExperimental
	override fun getFunctions(): List<PartiQLFunction> = listOf(
	TrimLead // Specify the functions
	)
	}
	```