[PATCH] Docs: Fixes link to I2C specification

[Deep Majumder]

The link to the I2C specification is broken and is replaced in this
patch by one that points to Rev 6 (2014) of the specification.
Although `https://www.nxp.com"; hosts the Rev 7 (2021) of this
specification, it is behind a login-wall and thus cannot be used.

Signed-off-by: Deep Majumder <deep@xxxxxxxxxxx>
---
 Documentation/i2c/summary.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/i2c/summary.rst b/Documentation/i2c/summary.rst
index 136c4e333be7..607c72425ca6 100644
--- a/Documentation/i2c/summary.rst
+++ b/Documentation/i2c/summary.rst
@@ -12,7 +12,7 @@ and so are not advertised as being I2C but come under different names,
 e.g. TWI (Two Wire Interface), IIC.
 
 The official I2C specification is the `"I2C-bus specification and user
-manual" (UM10204) <https://www.nxp.com/docs/en/user-guide/UM10204.pdf>`_
+manual" (UM10204) <https://www.pololu.com/file/0J435/UM10204.pdf>`_
 published by NXP Semiconductors.
 
 SMBus (System Management Bus) is based on the I2C protocol, and is mostly
-- 
2.30.2