Bad suggested fix for IncorrectAnonymousArgument error

[milesfrain]

A suggested fix in https://github.com/purescript/documentation/blob/master/errors/IncorrectAnonymousArgument.md#fix is:

mapArray = _ `map` [1, 2, 3]

But this fails to compile.

To reproduce:

spago init
echo "mapArray = _ \`map\` [1, 2, 3]" >> src/Main.purs
spago build

Error found:
at src/Main.purs:11:1 - 11:29 (line 11, column 1 - line 11, column 29)

  An anonymous function argument appears in an invalid context.

See https://github.com/purescript/documentation/blob/master/errors/IncorrectAnonymousArgument.md for more information,
or to contribute content related to this error.

[error] Failed to build.