Add issue number to DY.3 lineage notes

Resolves #1472

Author: corneliusroemer

lineage_notes.txt

@@ -1226,7 +1226,7 @@ BA.5.2.48	Alias of B.1.1.529.5.2.48, China, C2710T, C8626T, T17208C, from pango-
 DY.1	Alias of B.1.1.529.5.2.48.1, China, S:A570S
 DY.1.1	Alias of B.1.1.529.5.2.48.1.1 found mainly in China, from pango-designation issue #1599
 DY.2	Alias of B.1.1.529.5.2.48.2, China, N:Q241K, from #1478
-DY.3	Alias of B.1.1.529.5.2.48.3, China, ORF1a:T1788M
+DY.3	Alias of B.1.1.529.5.2.48.3, China, ORF1a:T1788M, from #1472
 DY.4	Alias of B.1.1.529.5.2.48.4, China, ORF1b:T2432I
 BA.5.2.49	Alias of B.1.1.529.5.2.49, China, S:T883I, A14673G, T16456C, from #1480
 DZ.1	Alias of B.1.1.529.5.2.49.1, China, S:D1146Y