go-build: add clarity (#7438)

pages/common/go-build.md

@@ -3,7 +3,7 @@
 > Compile Go sources.
 > More information: <https://golang.org/cmd/go/#hdr-Compile_packages_and_dependencies>.
 
-- Compile a file:
+- Compile a 'package main' file (output will be the filename without extension):
 
 `go build {{path/to/main.go}}`
 
@@ -15,6 +15,6 @@
 
 `go build -o {{path/to/binary}} {{path/to/package}}`
 
-- Compile a main package into an executable, with data race detection:
+- Compile a main package into an executable, enabling data race detection:
 
 `go build -race -o {{path/to/executable}} {{path/to/main/package}}`