Documentation/features: Correct RISC-V kprobes support entry

Documentation/features: Correct RISC-V kprobes support entry

The Documentation/features/debug/kprobes/arch-support.txt incorrectly
states that RISC-V has kprobes support. This is not the case.

Note that entries that have been incorrectly marked with 'ok' will not
be changed back to 'TODO' by the features-refresh.sh script.

Fixes: 7156fc292850 ("Documentation/features: Refresh the arch support status files in place")
Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Link: https://lore.kernel.org/r/20200523210005.59140-1-bjorn.topel@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>