minor typo

src/finiteVolume/fvMatrices/fvMatrix/fvMatrix.H

@@ -198,7 +198,7 @@ public:
 
     //- Solver class returned by the solver function
     //  used for systems in which it is useful to cache the solver for reuse
-    //  e.g. is the solver is potentialy expensive to construct (AMG) and can
+    //  e.g. if the solver is potentialy expensive to construct (AMG) and can
     //  be used several times (PISO)
     class fvSolver
     {