Fixed some typos

include/libfirm/firm_types.h

@@ -70,7 +70,7 @@ typedef struct ir_tarval            ir_tarval;
  * Type */
 typedef struct ir_type              ir_type;
 /** @ingroup ir_graph
- * Procedure Grpah */
+ * Procedure Graph */
 typedef struct ir_graph             ir_graph;
 /** @ingroup ir_prog
  * Program */

include/libfirm/irgraph.h

@@ -358,7 +358,7 @@ FIRM_API int irg_is_constrained(const ir_graph *irg,
                                 ir_graph_constraints_t constraints);
 
 /**
- * graph state. They properties about a graph.
+ * graph state. The properties about a graph.
  * Graph transformations may destroy these properties and have to explicitely
  * state when they did not affect some properties and want to keep them.
  */