docs: fix misleading internal import path in Getting Started guide - #4

Problem

The "Initializing ObjectBox" section of the Getting Started guide shows this import:

import (
    "github.com/objectbox/objectbox-go/objectbox"
    "github.com/objectbox/objectbox-go/examples/tasks/internal/model" // ❌ wrong
)

This is the import path of the internal example package inside the ObjectBox repository itself. In Go, internal packages can only be imported by code within the same module — so any user who copies this snippet verbatim will immediately get a compile error:

use of internal package github.com/objectbox/objectbox-go/examples/tasks/internal/model not allowed

This issue has been open since November 2020 (objectbox/objectbox-go#28) and has caused confusion for multiple users.

Fix

Replaced the internal import with a generic placeholder (github.com/my-org/my-project/internal/model) and added a {% hint style="warning" %} block that makes it explicit users must substitute their own module name:

import (
    "github.com/objectbox/objectbox-go/objectbox"
    "github.com/my-org/my-project/internal/model" // ✅ user's own module
)

This matches what the ObjectBox maintainer already explained in the issue thread — users should initialize their own Go module and use their own import paths.

Fixes objectbox/objectbox-go#28

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