Fixed typo (missing parenthesis) in get_path_info documentation

Change-Id: I8db7bfc74a0188634809453b5f5e88146be20fad
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/3941
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>

tools/gn/function_get_path_info.cc

diff --git a/tools/gn/function_get_path_info.cc b/tools/gn/function_get_path_info.cc
index 905092c..08f7e8c 100644
--- a/tools/gn/function_get_path_info.cc
+++ b/tools/gn/function_get_path_info.cc
@@ -192,7 +192,7 @@
   # result will be "//foo/bar"
 
   # Extract the source-absolute directory name,
-  result = get_path_info(get_path_info(path, "dir"), "abspath"
+  result = get_path_info(get_path_info(path, "dir"), "abspath")
 )";
 
 Value RunGetPathInfo(Scope* scope,