gn docs: Add a missing closing paren.

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 1534 matching lines @@
 const char kPublic[] = "public";
 const char kPublic_HelpShort[] =
     "public: [file list] Declare public header files for a target.";
 const char kPublic_Help[] =
     R"(public: Declare public header files for a target.
 
   A list of files that other targets can include. These permissions are checked
   via the "check" command (see "gn help check").
 
   If no public files are declared, other targets (assuming they have visibility
-  to depend on this target can include any file in the sources list. If this
+  to depend on this target) can include any file in the sources list. If this
   variable is defined on a target, dependent targets may only include files on
   this whitelist.
 
   Header file permissions are also subject to visibility. A target must be
   visible to another target to include any files from it at all and the public
   headers indicate which subset of those files are permitted. See "gn help
   visibility" for more.
 
   Public files are inherited through the dependency tree. So if there is a
   dependency A -> B -> C, then A can include C's public headers. However, the
@@ skipping 368 matching lines @@
     INSERT_VARIABLE(Testonly)
     INSERT_VARIABLE(Visibility)
     INSERT_VARIABLE(WriteRuntimeDeps)
   }
   return info_map;
 }
 
 #undef INSERT_VARIABLE
 
 }  // namespace variables