docs: fixed typo error.

Change-Id: Ic3ec1bfb150ec932e05ba5eda43537784f1fdcda
diff --git a/docs/manifest-format.md b/docs/manifest-format.md
index c85726b..d776a81 100644
--- a/docs/manifest-format.md
+++ b/docs/manifest-format.md
@@ -66,7 +66,7 @@
   <!ATTLIST project groups      CDATA #IMPLIED>
   <!ATTLIST project sync-c      CDATA #IMPLIED>
   <!ATTLIST project sync-s      CDATA #IMPLIED>
-  <!ATTLIST default sync-tags   CDATA #IMPLIED>
+  <!ATTLIST project sync-tags   CDATA #IMPLIED>
   <!ATTLIST project upstream CDATA #IMPLIED>
   <!ATTLIST project clone-depth CDATA #IMPLIED>
   <!ATTLIST project force-path CDATA #IMPLIED>