Fix makefile function call syntax

Before this change the newline character will be carried to the shell
command so no files will be returned.

Change-Id: Id71358a54bff2a672c70a235b37ad06ef65a839b

Docs.mk

@@ -15,9 +15,9 @@ endef
 #
 # $(1): directory for search (to support use from frameworks/base)
 define libcore_to_document
- $(call libcoredoc-all-java-files-under,$(1),
+ $(call libcoredoc-all-java-files-under,$(1), \
    dalvik/src/main/java/dalvik/system/ -maxdepth 1) \
- $(call libcoredoc-all-java-files-under,$(1),
+ $(call libcoredoc-all-java-files-under,$(1), \
    dalvik/src/main/java/dalvik/annotation \
    dalvik/src/main/java/dalvik/bytecode \
    json/src/main/java \