Add missing subdoc error to BinaryProtocol.md

Change-Id: I5126b3eb3f37f885f1337f664f0e7ebca50f8d3d
Reviewed-on: http://review.couchbase.org/c/kv_engine/+/137816
Tested-by: Build Bot <[email protected]>
Reviewed-by: Richard de Mellow <[email protected]>

Author: trondn

docs/BinaryProtocol.md

@@ -369,6 +369,7 @@ Possible values of this two-byte field:
 | 0x00d2 | (Subdoc) Can't modify virtual attributes |
 | 0x00d3 | (Subdoc) One or more paths in a multi-path command failed on a deleted document |
 | 0x00d4 | (Subdoc) Invalid XATTR order (xattrs should come first) |
+| 0x00d5 | (Subdoc) The server don't know this virtual macro |
 
 In addition to the above defined status codes, the range 0xff00 - 0xffff
 is reserved for end-user applications (e.g. proxies). Couchbase itself will