simple: update error message for KV cache check

This commit updates the error message that is printed when the
KV cache is not big enough to hold all the prompt and generated
tokens. Specifically it removes the reference to n_parallel and
replaces it with n_len.

Signed-off-by: Daniel Bevenius <daniel.bevenius@gmail.com>

examples/simple/simple.cpp

@@ -75,7 +75,7 @@ int main(int argc, char ** argv) {
     // make sure the KV cache is big enough to hold all the prompt and generated tokens
     if (n_kv_req > n_ctx) {
         LOG_TEE("%s: error: n_kv_req > n_ctx, the required KV cache size is not big enough\n", __func__);
-        LOG_TEE("%s:        either reduce n_parallel or increase n_ctx\n", __func__);
+        LOG_TEE("%s:        either reduce n_len or increase n_ctx\n", __func__);
         return 1;
     }