spec: explain function invocation and passing of parameters more precisely
- Describe that function invocation allocates space for a functions'
variables.
- Explain parameter passing in terms of assignments.
Change-Id: Ia693d73a570f7d1aa2ac05e6095b4e602e4e9bf2
Reviewed-on: https://go-review.googlesource.com/c/go/+/635800 Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Rob Pike <r@golang.org>