Noticed while reviewing code.
* safely set for relfrozenxid or relminmxid.
*
* Before entering the main loop, establish the invariant that
- * next_unskippable_block is the next block number >= blkno that's not we
+ * next_unskippable_block is the next block number >= blkno that we
* can't skip based on the visibility map, either all-visible for a
* regular scan or all-frozen for an aggressive scan. We set it to
* nblocks if there's no such block. We also set up the skipping_blocks