[GlobalOpt][NFC] Update option description for matmul generalization (#24565)

Updates the inaccurate description.

compiler/src/iree/compiler/GlobalOptimization/Passes.td

diff --git a/compiler/src/iree/compiler/GlobalOptimization/Passes.td b/compiler/src/iree/compiler/GlobalOptimization/Passes.td
index 496f493..8b9260e 100644
--- a/compiler/src/iree/compiler/GlobalOptimization/Passes.td
+++ b/compiler/src/iree/compiler/GlobalOptimization/Passes.td
@@ -101,7 +101,7 @@
   let summary = "Convert some Linalg named ops into linalg.generics.";
   let options = [
     Option<"enableGeneralizeMatmul", "enable-generalize-matmul", "bool",
-           /*default=*/"false", "Convert linalg named opt to generic ops.">,
+           /*default=*/"false", "Convert linalg named matmul ops to generic ops.">,
   ];
 }