Documentation: devres: add missing I2C helper

Add missing devm_i2c_add_adapter() to devres.rst. It's introduced by
commit 07740c9 ("i2c: core: add managed function for adding i2c
adapters").

Fixes: 07740c9 ("i2c: core: add managed function for adding i2c adapters")
Signed-off-by: Yang Yingliang <[email protected]>
Acked-by: Yicong Yang <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: Yang Yingliang

Documentation/driver-api/driver-model/devres.rst

@@ -279,6 +279,7 @@ GPIO
   devm_gpio_request_one()
 
 I2C
+  devm_i2c_add_adapter()
   devm_i2c_new_dummy_device()
 
 IIO