Update name of heading/anchor so link to hypre slides works

Author: rtmills

pages/session_synopses.md

@@ -116,8 +116,8 @@ model linear problem.
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-### Iterative Solvers & Algebraic Multigrid (with HYPRE)
-### Iterative Solvers & Algebraic Multigrid (with HYPRE)
+### Krylov Solvers & Algebraic Multigrid (with HYPRE)
+### Krylov Solvers & Algebraic Multigrid (with HYPRE)
 [Slides](../files/ATPESC-2023-Track-5-OsbornYang-Iterative-Solvers-hypre.pdf)
 
 This session will present the basic concepts of iterative linear solvers with focus on