Fix some typos in GN documentation.

tools/gn/function_template.cc

Index: tools/gn/function_template.cc
diff --git a/tools/gn/function_template.cc b/tools/gn/function_template.cc
index 290eb78a1aec71d072052e5dfdf1150614453c94..17dda0662d9fa8bfb82f943f57149d11f26e27d2 100644
--- a/tools/gn/function_template.cc
+++ b/tools/gn/function_template.cc
@@ -72,8 +72,8 @@ const char kTemplate_Help[] =
     "  have globally unique names, or you will get collisions.\n"
     "\n"
     "  Access the invoking name in your template via the implicit\n"
-    "  \"target_name\" variable. This should also be the basis of how other\n"
-    "  targets that a template expands to to ensure uniquness.\n"
+    "  \"target_name\" variable. This should also be the basis for how other\n"
+    "  targets that a template expands to ensure uniqueness.\n"
     "\n"
     "  A typical example would be a template that defines an action to\n"
     "  generate some source files, and a source_set to compile that source.\n"