Fix paths in gtest example

The zip file actually contains a gtest-1.7.0 directory that everything is under.

--
MOS_MIGRATED_REVID=93890530
diff --git a/site/docs/cpp.md b/site/docs/cpp.md
index 9dd2e52..a927d91 100644
--- a/site/docs/cpp.md
+++ b/site/docs/cpp.md
@@ -177,10 +177,10 @@
 Google Test has several "special" requirements that make its `cc_library` rule
 more complicated:
 
-* _src/gtest-all.cc_ `#include`s all of the other files in _src/_, so we
-  need to exclude it from the compile or we'll get link errors for duplicate
-  symbols.
-* It uses header files that relative to the _include/_ directory
+* _gtest-1.7.0/src/gtest-all.cc_ `#include`s all of the other files in
+  _gtest-1.7.0/src/_, so we need to exclude it from the compile or we'll get
+  link errors for duplicate symbols.
+* It uses header files that relative to the _gtest-1.7.0/include/_ directory
   (`"gtest/gtest.h"`), so we must add that directory the includes.
 * It uses "private" header files in src/, so we add "." to the includes so it
   can `#include "src/gtest-internal-inl.h"`.
@@ -192,13 +192,13 @@
 cc_library(
     name = "main",
     srcs = glob(
-        ["src/*.cc"],
-        exclude = ["src/gtest-all.cc"]
+        ["gtest-1.7.0/src/*.cc"],
+        exclude = ["gtest-1.7.0/src/gtest-all.cc"]
     ),
-    hdrs = glob(["include/**/*.h"]),
+    hdrs = glob(["gtest-1.7.0/include/**/*.h"]),
     includes = [
-        ".",
-        "include"
+        "gtest-1.7.0",
+        "gtest-1.7.0/include"
     ],
     linkopts = ["-pthread"],
     visibility = ["//visibility:public"],