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/crypto/rand/rand_arc4random.go

@@ -27,5 +27,6 @@ func (r *reader) Read(b []byte) (n int, err error) {
 }
 
 // void arc4random_buf(void *buf, size_t buflen);
+//
 //export arc4random_buf
 func libc_arc4random_buf(buf unsafe.Pointer, buflen uint)

src/crypto/rand/rand_windows.go

@@ -38,5 +38,6 @@ func (r *reader) Read(b []byte) (n int, err error) {
 // Cryptographically secure random number generator.
 // https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/rand-s?view=msvc-170
 // errno_t rand_s(unsigned int* randomValue);
+//
 //export rand_s
 func libc_rand_s(randomValue *uint32) int32