nixos/kanata: replace deflayer with deflayermap in config example

        type = types.lines;

        example = ''

          (defsrc

            grv  1    2    3    4    5    6    7    8    9    0    -    =    bspc

            tab  q    w    e    r    t    y    u    i    o    p    [    ]    \

            caps a    s    d    f    g    h    j    k    l    ;    '    ret

            lsft z    x    c    v    b    n    m    ,    .    /    rsft

            lctl lmet lalt           spc            ralt rmet rctl)

          (deflayer qwerty

            grv  1    2    3    4    5    6    7    8    9    0    -    =    bspc

            tab  q    w    e    r    t    y    u    i    o    p    [    ]    \

            @cap a    s    d    f    g    h    j    k    l    ;    '    ret

            lsft z    x    c    v    b    n    m    ,    .    /    rsft

            lctl lmet lalt           spc            ralt rmet rctl)

          (defalias

            ;; tap within 100ms for capslk, hold more than 100ms for lctl

            cap (tap-hold 100 100 caps lctl))

            caps)

          (deflayermap (default-layer)

            ;; tap caps lock as caps lock, hold caps lock as left control

            caps (tap-hold 100 100 caps lctl))

        '';

        description = ''

          Configuration other than `defcfg`.