[trac4309] Fix some typos

src/lib/dhcpsrv/alloc_engine.cc

-// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+// Copyright (C) 2012-2016 Internet Systems Consortium, Inc. ("ISC")
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -1628,20 +1628,20 @@ AllocEngine::reclaimExpiredLease(const Lease6Ptr& lease,
     if (!skipped) {
 
         // Generate removal name change request for D2, if required.
-        // This will return immediatelly if the DNS wasn't updated
+        // This will return immediately if the DNS wasn't updated
         // when the lease was created.
         queueNCR(CHG_REMOVE, lease);
 
         // Let's check if the lease that just expired is in DECLINED state.
-        // If it is, we need to conduct couple extra steps.
+        // If it is, we need to perform a couple extra steps.
         bool remove_lease = (reclaim_mode == DB_RECLAIM_REMOVE);
         if (lease->state_ == Lease::STATE_DECLINED) {
-            // Do extra steps required for declined lease reclaimation:
+            // Do extra steps required for declined lease reclamation:
             // - call the recover hook
             // - bump decline-related stats
             // - log separate message
-            // There's no point in keeping declined lease after its
-            // reclaimation. Declined lease doesn't have any client
+            // There's no point in keeping a declined lease after its
+            // reclamation. A declined lease doesn't have any client
             // identifying information anymore.  So we'll flag it for
             // removal unless the hook has set the skip flag.
             remove_lease = reclaimDeclined(lease);
@@ -1723,15 +1723,15 @@ AllocEngine::reclaimExpiredLease(const Lease4Ptr& lease,
         queueNCR(CHG_REMOVE, lease);
 
         // Let's check if the lease that just expired is in DECLINED state.
-        // If it is, we need to conduct couple extra steps.
+        // If it is, we need to perform a couple extra steps.
         bool remove_lease = (reclaim_mode == DB_RECLAIM_REMOVE);
         if (lease->state_ == Lease::STATE_DECLINED) {
-            // Do extra steps required for declined lease reclaimation:
+            // Do extra steps required for declined lease reclamation:
             // - call the recover hook
             // - bump decline-related stats
             // - log separate message
-            // There's no point in keeping declined lease after its
-            // reclaimation. Declined lease doesn't have any client
+            // There's no point in keeping a declined lease after its
+            // reclamation. A declined lease doesn't have any client
             // identifying information anymore.  So we'll flag it for
             // removal unless the hook has set the skip flag.
             remove_lease = reclaimDeclined(lease);
@@ -1747,6 +1747,8 @@ AllocEngine::reclaimExpiredLease(const Lease4Ptr& lease,
         }
     }
 
+    // Update statistics.
+
     // Decrease number of assigned addresses.
     StatsMgr::instance().addValue(StatsMgr::generateName("subnet",
                                                          lease->subnet_id_,