kernel: Fix "select" wording on HZ_250 description

kernel: Fix "select" wording on HZ_250 description

HZ_250 config description contains alternative choice for NTSC
media users (HZ_300), which is written as "selected 300Hz". This is
incorrect, as it implies that HZ_300 is automatically selected
whereas the user has chosen HZ_250 instead.

Fix the wording to "select 300Hz".

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20250203025000.17953-1-bagasdotme@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>