I ve added S:S680P to PC.2.2 defining mutation (#2976)

Nextclade tree shows PC.2.2 having also S:S680P as defining. So i ve added it here . h/t @xz-keg thx!

Co-authored-by: Cornelius Roemer <[email protected]>

Author: FedeGueli

lineage_notes.txt

@@ -1640,7 +1640,7 @@ PC.2	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2, ORF3a:V13L, from sars-cov-2-varia
 PC.2.1	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.1, ORF1a:P1921L, Singapore
 PC.2.1.1	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.1.1, ORF1b:Q1393R
 PC.2.1.2	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.1.2, ORF1a:L3116F
-PC.2.2	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.2, ORF1a:P971L, ORF1b:Q2252K, Singapore
+PC.2.2	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.2, ORF1a:P971L, ORF1b:Q2252K, S:S680P Singapore
 PC.2.3	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.2.3, T4165C
 PC.3	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.3, ORF1a:R287G
 PC.3.1	Alias of B.1.1.529.2.86.1.1.16.1.7.2.1.3.1, N:R204Q