fix link typo.

squiggle.c

@@ -25,7 +25,7 @@ uint64_t xorshift32(uint32_t* seed)
     // The reader isn't expected to understand this code immediately;
     // read the linked Wikipedia page!
     // Algorithm "xor" from p. 4 of Marsaglia, "Xorshift RNGs"
-    // See <https://stackoverflow.com/questions/53886131/how-does-xorshift64-works>
+    // See <https://stackoverflow.com/questions/53886131/how-does-xorshift32-works>
     // https://en.wikipedia.org/wiki/Xorshift
     // Also some drama: <https://www.pcg-random.org/posts/on-vignas-pcg-critique.html>, <https://prng.di.unimi.it/>
     // for floats