Update docs/stats.md

Co-authored-by: Peter Ralph <petrel.harp@gmail.com>

Author: apragsdale

docs/stats.md

@@ -713,7 +713,7 @@ polarised where appropriate.
 The `site` mode computes two-locus statistics summarized over alleles between
 all pairs of specified sites. The default behavior, leaving `sites`
 unspecified, will compute a matrix for all pairs of sites, with
-rows and columns representing each site in the tree sequence (i.e., an n×n
+one row and column for each site in the tree sequence (i.e., an n x n
 matrix where n is the number of sites in the tree sequence). We can also
 restrict the output to a subset of sites, either by specifying a single vector
 for both rows and columns or a pair of vectors for the row sites and column