constants: clarify use of implicit default types
constants: clarify use of implicit default types

A constant with numeric value 1, regardless of its implicit default type,
can be assigned to any "numeric" type, not just any "integer" type.
This corresponds to the examples.

Change-Id: If82fe12be245424421d9604149cf41e1e6b9ac3d
Reviewed-on: https://go-review.googlesource.com/c/website/+/342992
Trust: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website