Correctly render math in HTML docs.

docs/Doxyfile

@@ -1688,7 +1688,7 @@ FORMULA_MACROFILE      =
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-USE_MATHJAX            = NO
+USE_MATHJAX            = YES
 
 # With MATHJAX_VERSION it is possible to specify the MathJax version to be used.
 # Note that the different versions of MathJax have different requirements with

include/scran_graph_cluster/build_snn_graph.hpp

@@ -27,7 +27,7 @@ namespace scran_graph_cluster {
  * For the purposes of this ranking, each node has a rank of zero in its own nearest-neighbor set. 
  * More shared neighbors, or shared neighbors that are close to both observations, will generally yield larger weights.
  * - `NUMBER` defines the weight between two nodes as the number of shared nearest neighbors between them. 
- * The weight can range from zero to \$k + 1\$, as the node itself is included in its own nearest-neighbor set. 
+ * The weight can range from zero to \f$k + 1\f$, as the node itself is included in its own nearest-neighbor set. 
  * This is a simpler scheme that is also slightly faster but does not account for the ranking of neighbors within each set.
  * - `JACCARD` defines the weight between two nodes as the Jaccard index of their neighbor sets,
  * motivated by the algorithm used by the [**Seurat** R package](https://cran.r-project.org/package=seurat).