I2C: Fix V1 shared bus link.

Author: microbit-carlos

hardware/i2c.md

@@ -28,7 +28,7 @@ The external lines run to the edge connector and can be used for accessories.
 | motion sensor variant 1 (LSM303AGR)  | 0x19 (0x32/0x33) | 0x1E (0x3C/0x3D) | 0x70 (0xE0/0xE1) | 0x72 (0xE4/0xE5) |
 | motion sensor variant 2 (FXOS8700CQ) | 0x1F (0x3E/0x3F) | 0x1F (0x3E/0x3F) | 0x70 (0xE0/0xE1) | 0x72 (0xE4/0xE5) |
 
-While the micro:bit <span class="v2">V2</span> has a dedicated bus for the on-board I2C peripherals, the micro:bit <span class="v1">V1</span> shares the same bus for on-board and external I2C devices. Please check the [V1 shared bus](i2c-shared) documentation to check the reserved I2C addresses.
+While the micro:bit <span class="v2">V2</span> has a dedicated bus for the on-board I2C peripherals, the micro:bit <span class="v1">V1</span> shares the same bus for on-board and external I2C devices. Please check the [V1 shared bus](../i2c-shared/) documentation to check the reserved I2C addresses.
 
 ### Table of address used by micro:bit accessories (please edit)