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/syscall/file_hosted.go

@@ -22,5 +22,6 @@ func Getwd() (string, error) {
 }
 
 // char *getcwd(char *buf, size_t size)
+//
 //export getcwd
 func libc_getcwd(buf *byte, size uint) *byte