all: format code according to Go 1.19 rules

Go 1.19 started reformatting code in a way that makes it more obvious
how it will be rendered on pkg.go.dev. It gets it almost right, but not
entirely. Therefore, I had to modify some of the comments so that they
are formatted correctly.

src/runtime/runtime_arm7tdmi.go

@@ -40,6 +40,7 @@ var _sidata [0]byte
 var _edata [0]byte
 
 // Entry point for Go. Initialize all packages and call main.main().
+//
 //export main
 func main() {
 	// Initialize .data and .bss sections.