doc: add riscv64 to list of architectures

Signed-off-by: Stewart X Addison <[email protected]>

Author: sxa

doc/api/os.md

@@ -51,7 +51,7 @@ added: v0.5.0
 
 Returns the operating system CPU architecture for which the Node.js binary was
 compiled. Possible values are `'arm'`, `'arm64'`, `'ia32'`, `'mips'`,
-`'mipsel'`, `'ppc'`, `'ppc64'`, `'s390'`, `'s390x'`, and `'x64'`.
+`'mipsel'`, `'ppc'`, `'ppc64'`, `'riscv64'`, `'s390'`, `'s390x'`, and `'x64'`.
 
 The return value is equivalent to [`process.arch`][].
 

doc/api/process.md

@@ -871,7 +871,7 @@ added: v0.5.0
 
 The operating system CPU architecture for which the Node.js binary was compiled.
 Possible values are: `'arm'`, `'arm64'`, `'ia32'`, `'mips'`,`'mipsel'`, `'ppc'`,
-`'ppc64'`, `'s390'`, `'s390x'`, and `'x64'`.
+`'ppc64'`, `'riscv64'`, `'s390'`, `'s390x'`, and `'x64'`.
 
 ```mjs
 import { arch } from 'node:process';