docs, kprobes: Add riscv as supported architecture

Support of kprobes and kretprobes for riscv was introduced 3 years ago
by the following change:

commit c22b0bc ("riscv: Add kprobes supported")

Add riscv to the list of supported architectures.

Signed-off-by: Ivan Orlov <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: ivanorlovcodethink

Documentation/trace/kprobes.rst

@@ -322,6 +322,7 @@ architectures:
 - s390
 - parisc
 - loongarch
+- riscv
 
 Configuring Kprobes
 ===================