Try this.
Backslashes are mandatory to tell the compiler the code continues to the next line (you might want to align them properly) and you missed a comma between your fn_actions.
#include "keymap_common.h"
const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/* 0: qwerty */
KEYMAP(Q, W, E, R, T, Y, U, I, O, P, \
A, S, D, F, G, H, J, K, L, \
Z, X, C, V, B, N, M, RSFT, \
FN0, SPC, FN1), \
/* 1: FN 1 */
KEYMAP(TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS), \
/* 2: FN 2 */
KEYMAP(TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS, \
TRNS,TRNS,TRNS)
};
const uint16_t PROGMEM fn_actions[] = {
[0] = ACTION_LAYER_MOMENTARY(1),
[1] = ACTION_LAYER_MOMENTARY(2)
};