Update src/alloc/isolated_alloc.rs

Co-authored-by: Ralf Jung <post@ralfj.de>

Author: nia-e

src/alloc/isolated_alloc.rs

@@ -202,8 +202,7 @@ impl IsolatedAlloc {
                     self.page_ptrs
                 )
             };
-            // Since each bit of the bitset represents COMPRESSION_FACTOR bytes,
-            // we need to divide by that when getting the indices
+            // Mark this range as available in the page.
             let ptr_idx_pinfo = ptr_idx / COMPRESSION_FACTOR;
             let size_pinfo = size / COMPRESSION_FACTOR;
             for idx in ptr_idx_pinfo..ptr_idx_pinfo + size_pinfo {