Fixed some typos.

include/libfirm/dbginfo.h

@@ -81,7 +81,7 @@ typedef enum {
 	dbg_read_a_const,             /**< A Firm subgraph was replaced because of a read
 	                                   a constant optimization. */
 	dbg_rem_poly_call,            /**< Remove polymorphic call. */
-	dbg_dead_code,                /**< Removing unreachable code, I.e. blocks that are never executed. */
+	dbg_dead_code,                /**< Removing unreachable code, i.e. blocks that are never executed. */
 	dbg_opt_confirm,              /**< A Firm subgraph was replace because of a Confirmation. */
 	dbg_gvn_pre,                  /**< A Firm node was replace because of the GVN-PRE algorithm. */
 	dbg_combo,                    /**< A Firm node was replace because of the combo algorithm. */

ir/ana/vrp.c

@@ -574,7 +574,7 @@ void set_vrp_data(ir_graph *irg)
 
 		if (vrp_update_node(node)) {
 			/* if something changed, add successors to worklist*/
-			for (i = get_irn_n_outs(node) - 1; i >=0; --i) {
+			for (i = get_irn_n_outs(node) - 1; i >= 0; --i) {
 				succ =  get_irn_out(node, i);
 				waitq_put(env->workqueue, node);
 			}

ir/opt/opt_blocks.c

@@ -1074,7 +1074,7 @@ static void find_liveouts(ir_node *irn, void *ctx)
 }  /* find_liveouts */
 
 /**
- * Check if the current block is the meet block of a its predecessors.
+ * Check if the current block is the meet block of its predecessors.
  */
 static void check_for_cf_meet(ir_node *block, void *ctx)
 {