Fix incorrect documentation about excludeRefs

 https://gerrit-review.googlesource.com/c/plugins/pull-replication/+/341894
Changed the default exclusion filter, but the documentation has lagged
behind.

Update the documentation to reflect the actual default excludeRefs.

Change-Id: I51b67aeb5931ea7fbd52d226bc1766d39a47f730

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 81c5f24..44f3591 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -281,12 +281,6 @@
     the ref `foo/bar`, but no other refs.
 
     By default, the following refs are excluded from the git fetch calls:
-    - refs/users/*
-    - refs/meta/config
-    - refs/sequences/*
-    - refs/meta/external-ids
-    - refs/groups/*
-    - refs/meta/group-names
     - refs/cache-automerge/*
     - refs/starred-changes/*