Fix typo in gn documentation

Also updates an improper usage in a BUILD.gn file.

R=dpranke
BUG=None

Change-Id: I2d7d96f29165442e8642991a6db942b17b6c5012
Reviewed-on: https://chromium-review.googlesource.com/1069745Reviewed-by: David Turner <digit@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: David Turner <digit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561031}

third_party/android_crazy_linker/BUILD.gn

@@ -49,7 +49,7 @@ if (is_android) {
   #
   template("crazy_linker_library") {
     source_set(target_name) {
-      forward_variables_from(invoker, [ "*" ])
+      forward_variables_from(invoker, "*")
       sources = [
         "src/include/crazy_linker.h",
         "src/src/crazy_linker_api.cpp",
@@ -110,7 +110,7 @@ if (is_android) {
 
       include_dirs = [ "src/src" ]
 
-      if (defined(invoker.unit_tests) && invoker.unit_tests) {
+      if (defined(unit_tests) && unit_tests) {
         sources += [
           "src/src/crazy_linker_system_mock.cpp",
           "src/src/crazy_linker_system_mock.h",

tools/gn/docs/reference.md

@@ -2676,7 +2676,7 @@
 
     template("shared_library") {
       shared_library(shlib) {
-        forward_variables_from(invoker, [ "*" ])
+        forward_variables_from(invoker, "*")
         ...
       }
     }

tools/gn/function_template.cc

@@ -90,7 +90,7 @@ Overriding builtin targets
 
     template("shared_library") {
       shared_library(shlib) {
-        forward_variables_from(invoker, [ "*" ])
+        forward_variables_from(invoker, "*")
         ...
       }
     }