Fix example about java_binary to java_binary instead of java_library

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index c22368261f3f20b80bbd146d9600259d6b02ba60..54a781afdfa7a9a247943b711315bb303443547a 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -733,7 +733,7 @@ template("java_strings_grd_prebuilt") {
 #   datadeps, testonly
 #
 # Example
-#   java_library("foo") {
+#   java_binary("foo") {
 #     java_files = [ "org/chromium/foo/FooMain.java" ]
 #     deps = [ ":bar_java" ]
 #     main_class = "org.chromium.foo.FooMain"
@@ -834,7 +834,7 @@ template("junit_binary") {
   }
 }
 
-# Declare an java library target
+# Declare a java library target
 #
 # Variables
 #   deps: Specifies the dependencies of this target. Java targets in this list
@@ -932,7 +932,7 @@ template("java_library") {
   }
 }
 
-# Declare an java library target for a prebuilt jar
+# Declare a java library target for a prebuilt jar
 #
 # Variables
 #   deps: Specifies the dependencies of this target. Java targets in this list