pinconf-generic: fix style issues in pin_config_param doc

pinconf-generic: fix style issues in pin_config_param doc

Fixes following issues introduced in a  previous commit
to clarify values for pin config pull up and down types.

- replace spaces with tabs to be consistent with rest of the doc
- use capitalization for unit (ohms -> Ohms)

Signed-off-by: Niyas Sait <niyas.sait@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20221117123542.1154252-1-niyas.sait@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>