GN: Fix some typos in the documentation.

tools/gn/variables.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/variables.h"
 
 namespace variables {
 
 // Built-in variables ----------------------------------------------------------
 
@@ skipping 398 matching lines @@
 
   A list of config labels.
 
   All targets depending on this one, and recursively, all targets depending on
   those, will have the configs listed in this variable added to them. These
   configs will also apply to the current target.
 
   This addition happens in a second phase once a target and all of its
   dependencies have been resolved. Therefore, a target will not see these
   force-added configs in their "configs" variable while the script is running,
-  and then can not be removed. As a result, this capability should generally
+  and they can not be removed. As a result, this capability should generally
   only be used to add defines and include directories necessary to compile a
   target's headers.
 
   See also "public_configs".
 )"
     COMMON_ORDERING_HELP;
 
 const char kAllowCircularIncludesFrom[] = "allow_circular_includes_from";
 const char kAllowCircularIncludesFrom_HelpShort[] =
     "allow_circular_includes_from: [label list] Permit includes from deps.";
@@ skipping 1138 matching lines @@
     R"(public_configs: Configs to be applied on dependents.
 
   A list of config labels.
 
   Targets directly depending on this one will have the configs listed in this
   variable added to them. These configs will also apply to the current target.
 
   This addition happens in a second phase once a target and all of its
   dependencies have been resolved. Therefore, a target will not see these
   force-added configs in their "configs" variable while the script is running,
-  and then can not be removed. As a result, this capability should generally
+  and they can not be removed. As a result, this capability should generally
   only be used to add defines and include directories necessary to compile a
   target's headers.
 
   See also "all_dependent_configs".
 )"
     COMMON_ORDERING_HELP;
 
 const char kPublicDeps[] = "public_deps";
 const char kPublicDeps_HelpShort[] =
     "public_deps: [label list] Declare public dependencies.";
@@ skipping 326 matching lines @@
     INSERT_VARIABLE(Testonly)
     INSERT_VARIABLE(Visibility)
     INSERT_VARIABLE(WriteRuntimeDeps)
   }
   return info_map;
 }
 
 #undef INSERT_VARIABLE
 
 }  // namespace variables