Rename stubsjar to stubsSrcjar for droiddoc

Test: m -j core-docs
Bug: b/70351683
Change-Id: I90e4df3ba002c7488f3a80066bf3723b6f299b04
diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index 309854c..56369cf 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -23,8 +23,8 @@
 $(eval $(call copy-one-file,$(LOCAL_PREBUILT_MODULE_FILE),$(full_classes_jar)))
 $(eval $(call copy-one-file,$(LOCAL_PREBUILT_MODULE_FILE),$(full_classes_pre_proguard_jar)))
 
-ifdef LOCAL_DROIDDOC_STUBS_JAR
-$(eval $(call copy-one-file,$(LOCAL_DROIDDOC_STUBS_JAR),$(OUT_DOCS)/$(LOCAL_MODULE)-stubs.srcjar))
+ifdef LOCAL_DROIDDOC_STUBS_SRCJAR
+$(eval $(call copy-one-file,$(LOCAL_DROIDDOC_STUBS_SRCJAR),$(OUT_DOCS)/$(LOCAL_MODULE)-stubs.srcjar))
 ALL_DOCS += $(OUT_DOCS)/$(LOCAL_MODULE)-stubs.srcjar
 endif