fix typo in error message, twice (#4457)

Summary:
Fixes a typo in error messages returned by Iterator::GetProperty(...)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4457

Differential Revision: D10281965

Pulled By: sagar0

fbshipit-source-id: 1cd3c665f467ef06cdfd9f482692e6f8568f3d22

db/db_iter.cc

@@ -232,7 +232,7 @@ class DBIter final: public Iterator {
       *prop = saved_key_.GetUserKey().ToString();
       return Status::OK();
     }
-    return Status::InvalidArgument("Undentified property.");
+    return Status::InvalidArgument("Unidentified property.");
   }
 
   virtual void Next() override;

table/iterator.cc

@@ -103,7 +103,7 @@ Status Iterator::GetProperty(std::string prop_name, std::string* prop) {
     *prop = "0";
     return Status::OK();
   }
-  return Status::InvalidArgument("Undentified property.");
+  return Status::InvalidArgument("Unidentified property.");
 }
 
 namespace {