docs: i2c: summary: update I2C specification link

Luckily, the specs are directly downloadable again, so update the link.
Also update its title to the original name "I²C".

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Wolfram Sang 2024-06-21 09:30:09 +02:00
commit 75d148c90a