Update enable_i2c.markdown (#14181)

Minor grammatical changes.
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--- ---
title: "Enable i2c on the Home Assistant Operating System" title: "Enable I2C on the Home Assistant Operating System"
description: "Instructions on how to enable I2C on a Raspberry PI" description: "Instructions on how to enable I2C on a Raspberry PI"
--- ---
Home Assistant using the Home Assistant Operating System, is a managed environment. Home Assistant using the Home Assistant Operating System is a managed environment, which means you can't use existing methods to enable the I2C bus on a Raspberry Pi.
Which means you can't use existing methods to enable the I2C bus on a Raspberry Pi.
If you're attempting to add an external sensor, you will have to [enable the I2C interface in the Home Assistant configuration](https://github.com/home-assistant/hassos/blob/dev/Documentation/boards/raspberrypi.md#i2c) using a USB stick. If you're attempting to add an external sensor you will have to [enable the I2C interface in the Home Assistant configuration](https://github.com/home-assistant/hassos/blob/dev/Documentation/boards/raspberrypi.md#i2c) using a USB stick.
## Step by step instructions ## Step by step instructions