Update RELEASE_NOTES.md

Author: corbett5

RELEASE_NOTES.md

@@ -10,8 +10,8 @@ Version vxx.yy.zz -- Release date 20yy-mm-dd
 
 * Bug fixes:
   * Fixed indexing bug that produced a compilation error with GCC 10.
-  * Fixed a memory leak in CRSMatrix::assimilate.
-  * Fixed a memory leak in ArrayOfArraysView::free with non-trivially destructable values.
+  * Fixed a memory leak in `CRSMatrix::assimilate`.
+  * Fixed a memory leak in `ArrayOfArraysView::free` with non-trivially destructable values.
 
 Version v0.1.0 -- Release date 2020-10-13
 =========================================