fixup! sys/fmt: print(): use fflush(); stdio_write() vs. fwrite()

sys/fmt/fmt.c

@@ -507,8 +507,10 @@ uint32_t scn_u32_hex(const char *str, size_t n)
     return res;
 }
 
-/* native gets special treatment as native's stdio code is ...
- * special */
+/* native gets special treatment as native's stdio code is ... special.
+ * And when not building for RIOT, there's no `stdio_write()`.
+ * In those cases, just defer to `printf()`.
+ */
 #if IS_USED(MODULE_STDIO_NATIVE) || !defined(RIOT_VERSION)
 void print(const char *s, size_t n)
 {
@@ -517,7 +519,7 @@ void print(const char *s, size_t n)
 #else
 void print(const char *s, size_t n)
 {
-    /* flush the libc's output buffer so output is not intermangled. */
+    /* flush the libc's output buffer so output is not intermingled. */
     fflush(stdout);
 
     stdio_write(s, n);