reflect: fix incorrect comment on elemType

[aykevl]

PR that introduced this: #4543

elemType has a different set of fields than interfaceType, but the comment says something else.

[github-actions]

Size difference with the dev branch:

Binary size difference

not the same command!
    tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
    go: downloading tinygo.org/x/tinyfont v0.3.0
 flash                          ram
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  16720   16720      0   0.00%    4172    4172      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
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[deadprogram]

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