While I agree with your point, the example you gave feels like a straw man. Or at least, a separation of "sharp edges" and "long documentation needed".

Phrased differently:

Go: To make a something public, start the var name with uppercase.

C++: To make things public, type the word 'public'.

The Go pattern seems like more of a sharp edge than the C++ version, even though the C++ version might need more reading to learn.